diff --git a/PORT_STATUS.md b/PORT_STATUS.md
index eca8cfb..3b0b0f2 100644
--- a/PORT_STATUS.md
+++ b/PORT_STATUS.md
@@ -7,23 +7,28 @@
 ## ▶ RESUME HERE (session handoff, 2026-07-01)
 
 **State:** branch `port/strip-phase`. Sheets in `carrier/`: root `CM5IO`, `CM5_GPIO`,
-`CM5_HighSpeed` (reference, stripped), `M2_Ekey` (E-key, done), `Power` (**stages 1–4 done —
-power sheet complete**). Baseline anchor: `analysis/baseline/carrier_stripped.json`.
+`CM5_HighSpeed` (reference, stripped), `M2_Ekey`, `Power` (stages 1–4), `GPS_PPS`. **ALL
+rev-A circuit blocks are now captured.** Baseline anchor: `analysis/baseline/carrier_stripped.json`.
 
-**Done:** strip phase (microSD/HDMI/MIPI/PCIe-M2); M.2 E-key sheet (PCIe ×1 to CM5); Power
-stage 1 (LM74700 ideal-diode input protection → `VIN_PROT`); Power stage 2 (LM61460-Q1
-15→`+5v` 5 A, SPICE 5.02 V); Power stage 3 (LM61460-Q1 15→`+3V3_RF` 4 A, SPICE 3.32 V; EN ←
-CM5 `PCIE_PWR_EN`/106 + 100k pull-down); Power stage 4 (TPS54202 15→`+3V3_AUX` ~1 A, SPICE
-3.315 V; UVLO divider start 10.1 V / stop 8.6 V). Current whole-design **ERC = 133** (all
-pre-existing types; a good edit adds **zero new**).
+**Done:** strip phase (microSD/HDMI/MIPI/PCIe-M2); M.2 E-key sheet (PCIe ×1); Power stage 1
+(LM74700 → `VIN_PROT`), stage 2 (LM61460-Q1 → `+5v` 5 A, SPICE 5.02 V), stage 3 (LM61460-Q1 →
+`+3V3_RF` 4 A, SPICE 3.32 V, EN ← `PCIE_PWR_EN`), stage 4 (TPS54202 → `+3V3_AUX` ~1 A, SPICE
+3.315 V); **GPS + PPS sheet** (`carrier/GPS_PPS.kicad_sch` via `tools/build_gps.py`: J_GPS
+5-pin per Pinout_BOM §6, PPS → PESD3V3 TVS → 74LVC1G17 @ +3V3_AUX → `PPS_CLEAN` → Rs 33Ω →
+`SYNC_OUT` (CM5 pin 18 + J2.6) + J_PPS1/J_PPS2 taps; NMEA on **UART2 GPIO4/GPIO5** per
+correction C2 — netlist: GPIO4 = Module1.54+J8.7+J_GPS.3, GPIO5 = Module1.34+J8.29+J_GPS.2).
+The `SYNC_OUT`/`GPIO4`/`GPIO5` local labels on CM5_GPIO were converted to **global** labels
+(names unchanged, nothing else used them) to reach the new sheet without root plumbing.
+Current whole-design **ERC = 133** (all pre-existing types; a good edit adds **zero new**).
 
-**NEXT ACTION → GPS + PPS distribution sheet** (last new block, see step 5 below): GPS
-connector (PPS + UART + 3V3 + GND, powered from `+3V3_AUX`); PPS → TVS → Schmitt buffer
-(LVC1G17 @ 3.3 V) → fan-out: CM5 `Ethernet_SYNC_OUT` (J2 pin-6 net, no translator) + 2 header
-taps. Reuse the build_*.py generator pattern (new `tools/build_gps.py` or extend build_power).
-UART: decide which CM5 UART pins to use (check `CM5_GPIO` — reserve/label; datasheet is the
-authority). After that: whole-power-tree budget review, then hygiene pass (title blocks, refdes
-numbering — note generated refs like `J_E`/`J_PWR` trip kicad-cli's "annotation errors" warning).
+**NEXT ACTION → design-review + close-out passes** (no new blocks):
+1. **Power-budget review** of the whole tree (loads vs ratings; the kicad skill's power-tree
+   check) + re-read PORT_STATUS "Confirm vs datasheet" leftovers (stage-1 C_VCAP/FET pick,
+   stage-2/3 L saturation ≥ Ipk, RT freq).
+2. **Hygiene pass** (checklist in kicad-port skill): refdes numbering (un-numbered generated
+   refs `J_E`/`J_PWR`/`U_BUCK5`… trip kicad-cli "annotation errors" — decide whether to number
+   them), title blocks, netlist-vs-BOM sanity, design notes.
+3. Then merge `port/strip-phase` → main and start layout prep (DF40 placement copy from ref).
 
 **How to build/verify (every change):**
 - Sheets are generated wholesale — edit `tools/build_ekey.py` / `tools/build_power.py`, then
@@ -135,8 +140,18 @@ Notes that bit us (don't re-learn the hard way):
    - **Stage 2 — U_BUCK5 15→`+5v` 5A ✅ DONE.** `LM61460-Q1` (6A, 42V absmax sync; **custom symbol built from the datasheet** → `carrier/CM5IO.kicad_sym` as `CM5IO:LM61460-Q1`, fp `Package_SO:Texas_HTSSOP-14-1EP…ThermalVias`). VREF=1.0V → FB divider R_FBT5 40.2k / R_FBB5 10.0k = **5.02V (SPICE-confirmed vfb=1.0V)**. L5 4.7µH, Cout 2×47µF/16V, Cin 2×10µF/50V, Cboot 100n+Rboot 4.7Ω, RT 31.6k(~400kHz), BIAS→+5v, EN→VIN_PROT, PGOOD 100k→+5v. **`+5v` kept HIERARCHICAL** (pre-existing carrier net; global would collide `same_local_global_label`) — Power sheet exposes a `+5v` sheet pin, tied into the root `+5v` net; netlist-verified it drives Module1 + GPIO + USB. ERC 133→133 (zero new); analyzer +32 added **0 regressions**; SPICE 12/13 pass, 1 benign warn (L5/Cboot mis-detected as LC filter). **Confirm vs datasheet:** RT freq, L sat ≥7A, EP=pad15, optional EN UVLO divider.
    - **Stage 3 — U_BUCK33R 15→`+3V3_RF` 4A ✅ DONE.** Second `LM61460-Q1` (shared BOM with stage 2: L 4.7µH/7A ripple ~1.3A=33%, Cin 2×10µ/50V, Cout 2×47µ/16V, RT 31.6k ~420kHz, Cboot 100n+Rboot 4.7). FB divider R_FBT33 23.2k / R_FBB33 10.0k = **3.32V (SPICE: vfb 0.994V, inrush settles 3.32V)**. BIAS→`+3V3_RF` (datasheet: valid ≥3.1V, auto-falls back to VIN below). **EN ← CM5 `PCIE_PWR_EN`** (Module1 pin 106: NC swapped for a global label on `CM5_HighSpeed`) + **R_EN33 100k pull-down** (mirrors reference R14 — netlist-verified `Module1.106 + U_BUCK33R.7 + R_EN33.1`) so the Wi-Fi rail is OFF until the CM5 asserts it. **E-key temp `#FLG33RF` PWR_FLAG removed** (build_ekey); the buck's PWR_FLAG on L33.2 is now the sole `+3V3_RF` driver — netlist shows buck + all 4 J_E power pins + pull-ups + decoupling on one net. Verify: ERC 133→133 zero new; analyzer +49 added **0 regressions**; SPICE 17 pass / 2 benign warn (the L/C_BOOT "LC filter" mis-detect, once per buck) / 0 fail. (Note: `kicad-cli` netlist export prints a pre-existing "annotation errors" warning — un-numbered generated refdeses like `J_E`/`J_PWR`; present at fd627f5 too, cosmetic.)
    - **Stage 4 — U_BUCK33A 15→`+3V3_AUX` ~1A ✅ DONE (power sheet complete).** `TPS54202` (SOT-23-6, sync, fixed 500kHz, VFB=0.596V). **Abs-max gate PASSED but thin:** VIN abs-max **30V** vs SMBJ18A clamp ≤29.2V at full rated 600W surge → 0.8V transient margin (operating max 28V is not the surge number). Custom symbol `CM5IO:TPS54202` (the KiCad lib symbol `extends TPS54302` — no own pins, can't embed standalone) + bare copy in `carrier/CM5IO.kicad_sym`. FB per TI's 3.3V table row: **100k/22.1k + Cff 56pF → 3.29V (SPICE: vfb 0.597V, inrush settles 3.315V)**. L 10µH/2.5A (ΔI~0.52A), Cout 2×22µF/16V, Cboot 100n, Cin 10µF/50V+100n. **EN abs-max is only 7V → NO direct VIN tie** (unlike LM61460): UVLO divider **866k/110k** (solved from Ip=0.7µA/Ih=1.55µA, VEN 1.21/1.19V) → **start 10.13V / stop 8.61V**, EN ~1.9V at 15V in (~3.5V at 29V clamp — safe). FB+EN pins typed `passive` (divider-only nets). Verify: ERC 133→133 zero new; analyzer +65/−0 zero regressions (warn/error set identical to stage 3); SPICE 23 pass / 2 benign warn / 0 fail / 0 skip. **New tooling gap found:** `simulate_subcircuits.py` lowercases refdeses into SPICE names — `C_IN33A` vs stage-3 `C_IN33a` collided ("device already exists") and silently SKIPPED the whole VIN_PROT decoupling group → renamed to `C_IN33Aa`. Rule: **never create refdeses differing only by case.**
-5. **GPS + PPS distribution**: GPS connector (PPS+UART+3V3+GND); PPS → TVS → Schmitt (LVC1G17) →
-   fan-out: CM5 `Ethernet_SYNC_OUT` (J2 pin-6 net, 3.3V, no translator) + 2 header taps. SPICE/timing check.
+5. **GPS + PPS distribution ✅ DONE** (`carrier/GPS_PPS.kicad_sch`, generated by `tools/build_gps.py`).
+   Per Pinout_BOM §6 (the authority — it CORRECTS the design doc): J_GPS 5-pin (1=PPS, 2=NMEA_RX←GPS TX,
+   3=NMEA_TX→GPS RX, 4=+3V3_AUX, 5=GND); `GPS_PPS_RAW` → TVS_PPS `PESD3V3L1BA` → U_PPS `74LVC1G17`
+   (SOT-23-5, +3V3_AUX, pin 1 true-NC) → `PPS_CLEAN` → R_PPS 33Ω → `SYNC_OUT` + J_PPS1 (UWB) / J_PPS2
+   (scope), 2-pin taps. **NMEA = UART2 on GPIO4/GPIO5** (correction C2; UART0/GPIO14-15 stays debug).
+   Cross-sheet wiring: converted the 6 local labels (`SYNC_OUT`×2, `GPIO4`×2, `GPIO5`×2 on CM5_GPIO) to
+   **global** labels — net names unchanged so no multi-label (LB-001) findings, ERC-neutral (133→133);
+   GPS sheet uses the same global names, root sheet-symbol has NO pins. J_GPS pins 1/2 re-typed `output`
+   (GPS module drives PPS + TX) so the analyzer's no_driver gate passes — same trick as the E-key socket.
+   **Verify:** ERC 133→133 zero new; analyzer +73/−0 **0 regressions** (only the pre-existing MPN-coverage
+   counter moved 50→57 parts); netlist confirms all 6 cross-sheet nets (SYNC_OUT = Module1.18+J2.6+R_PPS.2);
+   SPICE 24 pass / 2 benign warn / 0 fail / 0 skip.
 
 ## Out-of-repo notes
 
diff --git a/carrier/CM5IO.kicad_pro b/carrier/CM5IO.kicad_pro
index b6a9527..28031b9 100644
--- a/carrier/CM5IO.kicad_pro
+++ b/carrier/CM5IO.kicad_pro
@@ -841,6 +841,10 @@
     [
       "9c7ccf72-dd3e-5ed3-bb43-2939833eb069",
       "Power"
+    ],
+    [
+      "5efffb63-edbb-5986-86d3-84ead412bc65",
+      "GPS_PPS"
     ]
   ],
   "text_variables": {}
diff --git a/carrier/CM5IO.kicad_sch b/carrier/CM5IO.kicad_sch
index 3154767..6bdcfdc 100644
--- a/carrier/CM5IO.kicad_sch
+++ b/carrier/CM5IO.kicad_sch
@@ -3489,6 +3489,16 @@
 		(effects (font (size 1.27 1.27)) (justify left))
 		(uuid "f1109a7e-4bfb-54f4-a32e-e6719bad4ba8")
 	)
+	(sheet
+		(at 205 90)
+		(size 30 20)
+		(stroke (width 0.1524) (type solid) (color 132 0 132 1))
+		(fill (color 255 255 255 0.0000))
+		(uuid "5efffb63-edbb-5986-86d3-84ead412bc65")
+		(property "Sheetname" "GPS_PPS" (at 205 86.18 0) (effects (font (size 1.27 1.27)) (justify left bottom)))
+		(property "Sheetfile" "GPS_PPS.kicad_sch" (at 205 87.45 0) (effects (font (size 1.27 1.27)) (justify left top)))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55" (page "6"))))
+	)
 	(sheet_instances
 		(path "/"
 			(page "1")
diff --git a/carrier/CM5_GPIO.kicad_sch b/carrier/CM5_GPIO.kicad_sch
index b596853..89a7cdf 100644
--- a/carrier/CM5_GPIO.kicad_sch
+++ b/carrier/CM5_GPIO.kicad_sch
@@ -13645,7 +13645,8 @@
 		)
 		(uuid "05c1c0ae-f846-4942-b9ca-9f0f8f62492d")
 	)
-	(label "GPIO5"
+	(global_label "GPIO5"
+		(shape bidirectional)
 		(at 24.13 62.23 0)
 		(fields_autoplaced yes)
 		(effects
@@ -13964,7 +13965,8 @@
 		)
 		(uuid "2e95b89a-d151-4ceb-8ea1-75ed88f1541e")
 	)
-	(label "GPIO4"
+	(global_label "GPIO4"
+		(shape bidirectional)
 		(at 24.13 87.63 0)
 		(fields_autoplaced yes)
 		(effects
@@ -14316,7 +14318,8 @@
 		)
 		(uuid "6fa8342e-2989-40ca-b0ae-b207f17ca831")
 	)
-	(label "SYNC_OUT"
+	(global_label "SYNC_OUT"
+		(shape bidirectional)
 		(at 54.61 175.26 180)
 		(fields_autoplaced yes)
 		(effects
@@ -14459,7 +14462,8 @@
 		)
 		(uuid "88ce3174-a8b3-4149-886a-872ed4746e98")
 	)
-	(label "SYNC_OUT"
+	(global_label "SYNC_OUT"
+		(shape bidirectional)
 		(at 24.13 41.91 0)
 		(fields_autoplaced yes)
 		(effects
@@ -14525,7 +14529,8 @@
 		)
 		(uuid "91fb974e-99de-4e0c-bee5-7a6f88905951")
 	)
-	(label "GPIO5"
+	(global_label "GPIO5"
+		(shape bidirectional)
 		(at 147.32 59.69 180)
 		(fields_autoplaced yes)
 		(effects
@@ -15053,7 +15058,8 @@
 		)
 		(uuid "f6429ab2-213c-4030-a705-9f073170a98c")
 	)
-	(label "GPIO4"
+	(global_label "GPIO4"
+		(shape bidirectional)
 		(at 147.32 31.75 180)
 		(fields_autoplaced yes)
 		(effects
diff --git a/carrier/GPS_PPS.kicad_sch b/carrier/GPS_PPS.kicad_sch
new file mode 100644
index 0000000..0ac9d3d
--- /dev/null
+++ b/carrier/GPS_PPS.kicad_sch
@@ -0,0 +1,1453 @@
+(kicad_sch
+	(version 20231120)
+	(generator "eeschema")
+	(generator_version "8.0")
+	(uuid "271743c9-a477-5c0b-8588-e5a06137596b")
+	(paper "A4")
+	(title_block
+		(title "CM5 Carrier - GPS + PPS distribution")
+		(rev "A")
+		(comment 1 "GPS conn (PPS+UART2+3V3_AUX) -> TVS -> LVC1G17 -> CM5 SYNC + 2 taps; PPS sink only")
+	)
+	(lib_symbols
+(symbol "Device:R"
+			(pin_numbers hide)
+			(pin_names
+				(offset 0)
+			)
+			(exclude_from_sim no)
+			(in_bom yes)
+			(on_board yes)
+			(property "Reference" "R"
+				(at 2.032 0 90)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
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+			)
+			(property "Value" "R"
+				(at 0 0 90)
+				(effects
+					(font
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+			(property "Footprint" ""
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+				(effects
+					(font
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+					(hide yes)
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+			(property "Datasheet" "~"
+				(at 0 0 0)
+				(effects
+					(font
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+					)
+					(hide yes)
+				)
+			)
+			(property "Description" "Resistor"
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(property "ki_keywords" "R res resistor"
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(property "ki_fp_filters" "R_*"
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
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+			(symbol "R_0_1"
+				(rectangle
+					(start -1.016 -2.54)
+					(end 1.016 2.54)
+					(stroke
+						(width 0.254)
+						(type default)
+					)
+					(fill
+						(type none)
+					)
+				)
+			)
+			(symbol "R_1_1"
+				(pin passive line
+					(at 0 3.81 270)
+					(length 1.27)
+					(name "~"
+						(effects
+							(font
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+						)
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+					(number "1"
+						(effects
+							(font
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+				(pin passive line
+					(at 0 -3.81 90)
+					(length 1.27)
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+							(font
+								(size 1.27 1.27)
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+						)
+					)
+				)
+			)
+		)
+(symbol "Device:C"
+			(pin_numbers hide)
+			(pin_names
+				(offset 0.254)
+			)
+			(exclude_from_sim no)
+			(in_bom yes)
+			(on_board yes)
+			(property "Reference" "C"
+				(at 0.635 2.54 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(justify left)
+				)
+			)
+			(property "Value" "C"
+				(at 0.635 -2.54 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(justify left)
+				)
+			)
+			(property "Footprint" ""
+				(at 0.9652 -3.81 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(property "Datasheet" "~"
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(property "Description" "Unpolarized capacitor"
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(property "ki_keywords" "cap capacitor"
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(property "ki_fp_filters" "C_*"
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(symbol "C_0_1"
+				(polyline
+					(pts
+						(xy -2.032 -0.762) (xy 2.032 -0.762)
+					)
+					(stroke
+						(width 0.508)
+						(type default)
+					)
+					(fill
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+					)
+				)
+				(polyline
+					(pts
+						(xy -2.032 0.762) (xy 2.032 0.762)
+					)
+					(stroke
+						(width 0.508)
+						(type default)
+					)
+					(fill
+						(type none)
+					)
+				)
+			)
+			(symbol "C_1_1"
+				(pin passive line
+					(at 0 3.81 270)
+					(length 2.794)
+					(name "~"
+						(effects
+							(font
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+						(effects
+							(font
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+					(length 2.794)
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+							(font
+								(size 1.27 1.27)
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+						)
+					)
+				)
+			)
+		)
+(symbol "power:GND"
+			(power)
+			(pin_numbers hide)
+			(pin_names
+				(offset 0) hide)
+			(exclude_from_sim no)
+			(in_bom yes)
+			(on_board yes)
+			(property "Reference" "#PWR"
+				(at 0 -6.35 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(property "Value" "GND"
+				(at 0 -3.81 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+				)
+			)
+			(property "Footprint" ""
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(property "Datasheet" ""
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(property "Description" "Power symbol creates a global label with name \"GND\" , ground"
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(property "ki_keywords" "global power"
+				(at 0 0 0)
+				(effects
+					(font
+						(size 1.27 1.27)
+					)
+					(hide yes)
+				)
+			)
+			(symbol "GND_0_1"
+				(polyline
+					(pts
+						(xy 0 0) (xy 0 -1.27) (xy 1.27 -1.27) (xy 0 -2.54) (xy -1.27 -1.27) (xy 0 -1.27)
+					)
+					(stroke
+						(width 0)
+						(type default)
+					)
+					(fill
+						(type none)
+					)
+				)
+			)
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+		(pin "1" (uuid "2800b758-4e63-5406-9dc3-186319d34c26"))
+		(pin "2" (uuid "8629d0b8-e972-5f9e-a4bf-9c4d77598d49"))
+		(pin "3" (uuid "eb14636c-36ea-5f12-9638-ab5dbf1e88dc"))
+		(pin "4" (uuid "adc66aba-f702-5a90-ba64-00edf9d37c0f"))
+		(pin "5" (uuid "de9497d8-1db5-5818-ad9f-17088ecfc768"))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55/5efffb63-edbb-5986-86d3-84ead412bc65" (reference "J_GPS") (unit 1))))
+	)
+	(label "GPS_PPS_RAW"
+		(at 54.61 74.93 0)
+		(effects (font (size 1.27 1.27)) (justify left))
+		(uuid "e7aa6a9d-eb6b-5208-acec-1bc4c0bf2a95")
+	)
+	(global_label "GPIO5"
+		(shape input)
+		(at 54.61 77.47 0)
+		(effects (font (size 1.27 1.27)) (justify left))
+		(uuid "63716f7d-d0db-50c3-84f3-59b876fc736e")
+	)
+	(global_label "GPIO4"
+		(shape input)
+		(at 54.61 80.01 0)
+		(effects (font (size 1.27 1.27)) (justify left))
+		(uuid "85f684d3-5dba-5452-a4d3-a7794b2c2dea")
+	)
+	(global_label "+3V3_AUX"
+		(shape input)
+		(at 54.61 82.55 0)
+		(effects (font (size 1.27 1.27)) (justify left))
+		(uuid "edf7cfab-9055-5cbe-9eee-6e835d2fcfc1")
+	)
+	(symbol
+		(lib_id "power:GND")
+		(at 54.61 85.09 0)
+		(unit 1)
+		(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)
+		(uuid "01e18e05-a999-5bec-930e-f710b0678f9c")
+		(property "Reference" "#PWRJ_GPS5" (at 54.61 88.09 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Value" "GND" (at 54.61 87.09 0) (effects (font (size 1.27 1.27))))
+		(property "Footprint" "" (at 54.61 85.09 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Datasheet" "" (at 54.61 85.09 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(pin "1" (uuid "6f24e473-b057-5455-a8f6-b9f8c95bd2e0"))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55/5efffb63-edbb-5986-86d3-84ead412bc65" (reference "#PWRJ_GPS5") (unit 1))))
+	)
+	(symbol
+		(lib_id "Device:D_TVS")
+		(at 85.09 95.25 0)
+		(unit 1)
+		(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)
+		(uuid "9e9aee7c-1576-5761-afbb-0e9ea077ab86")
+		(property "Reference" "TVS_PPS" (at 87.63000000000001 94.25 0) (effects (font (size 1.27 1.27)) (justify left)))
+		(property "Value" "PESD3V3L1BA" (at 87.63000000000001 96.25 0) (effects (font (size 1.27 1.27)) (justify left)))
+		(property "Footprint" "Diode_SMD:D_SOD-323" (at 85.09 95.25 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Datasheet" "" (at 85.09 95.25 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Description" "" (at 85.09 95.25 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(pin "1" (uuid "0bbe2ed0-ed29-5580-a5aa-d33761afc0a3"))
+		(pin "2" (uuid "d76dcdde-6b02-55f1-bd71-0bcaf3d2b329"))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55/5efffb63-edbb-5986-86d3-84ead412bc65" (reference "TVS_PPS") (unit 1))))
+	)
+	(label "GPS_PPS_RAW"
+		(at 81.28 95.25 0)
+		(effects (font (size 1.27 1.27)) (justify left))
+		(uuid "6720173f-2657-5cea-b19a-b08f5c85e428")
+	)
+	(symbol
+		(lib_id "power:GND")
+		(at 88.9 95.25 0)
+		(unit 1)
+		(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)
+		(uuid "0c7c62b4-f16d-5844-82d2-fb1373bab471")
+		(property "Reference" "#PWRTVS_PPS2" (at 88.9 98.25 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Value" "GND" (at 88.9 97.25 0) (effects (font (size 1.27 1.27))))
+		(property "Footprint" "" (at 88.9 95.25 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Datasheet" "" (at 88.9 95.25 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(pin "1" (uuid "70ebf9ed-18f8-5f65-9320-3ca48ac752fb"))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55/5efffb63-edbb-5986-86d3-84ead412bc65" (reference "#PWRTVS_PPS2") (unit 1))))
+	)
+	(symbol
+		(lib_id "74xGxx:74LVC1G17")
+		(at 110.49 80.01 0)
+		(unit 1)
+		(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)
+		(uuid "b9a5c7d5-1d79-5486-9853-8569ecb1c277")
+		(property "Reference" "U_PPS" (at 113.03 79.01 0) (effects (font (size 1.27 1.27)) (justify left)))
+		(property "Value" "74LVC1G17" (at 113.03 81.01 0) (effects (font (size 1.27 1.27)) (justify left)))
+		(property "Footprint" "Package_TO_SOT_SMD:SOT-23-5" (at 110.49 80.01 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Datasheet" "" (at 110.49 80.01 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Description" "" (at 110.49 80.01 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(pin "1" (uuid "1a1a2182-9411-5c6b-8833-bf2529edb275"))
+		(pin "2" (uuid "242d5819-8cf5-58ce-bd6d-0c2a2de6979b"))
+		(pin "3" (uuid "2cb9ef1c-5101-5f27-a2df-081cff8ac0a6"))
+		(pin "4" (uuid "6b04d93d-0dda-5fc4-b7f9-7cc4a4e96f59"))
+		(pin "5" (uuid "8a47cd9f-b4a4-5e36-ac7f-11c086d08151"))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55/5efffb63-edbb-5986-86d3-84ead412bc65" (reference "U_PPS") (unit 1))))
+	)
+	(label "GPS_PPS_RAW"
+		(at 97.79 80.01 0)
+		(effects (font (size 1.27 1.27)) (justify left))
+		(uuid "36c0628b-43d1-5424-8e10-f7e48394af28")
+	)
+	(label "PPS_CLEAN"
+		(at 120.65 80.01 0)
+		(effects (font (size 1.27 1.27)) (justify left))
+		(uuid "2998a9b6-fc67-563b-ac4c-3491ba9b5088")
+	)
+	(global_label "+3V3_AUX"
+		(shape input)
+		(at 105.41 69.85 0)
+		(effects (font (size 1.27 1.27)) (justify left))
+		(uuid "d403546c-9b63-5bf6-a5b4-92207c007f5d")
+	)
+	(symbol
+		(lib_id "power:GND")
+		(at 105.41 90.17 0)
+		(unit 1)
+		(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)
+		(uuid "150b7c14-ad6b-5275-86ea-8a7681618fe1")
+		(property "Reference" "#PWRU_PPS3" (at 105.41 93.17 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Value" "GND" (at 105.41 92.17 0) (effects (font (size 1.27 1.27))))
+		(property "Footprint" "" (at 105.41 90.17 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Datasheet" "" (at 105.41 90.17 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(pin "1" (uuid "9e7034db-c1af-5d71-b106-8f708c4fd18e"))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55/5efffb63-edbb-5986-86d3-84ead412bc65" (reference "#PWRU_PPS3") (unit 1))))
+	)
+	(no_connect (at 102.87 74.93) (uuid "f7cb859a-b2a2-52fc-8bf4-fbb0ad6f5c33"))
+	(symbol
+		(lib_id "Device:C")
+		(at 100.33 95.25 0)
+		(unit 1)
+		(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)
+		(uuid "0ee7ad07-7dd3-527f-b230-1f11a45b867e")
+		(property "Reference" "C_PPS" (at 102.87 94.25 0) (effects (font (size 1.27 1.27)) (justify left)))
+		(property "Value" "100n" (at 102.87 96.25 0) (effects (font (size 1.27 1.27)) (justify left)))
+		(property "Footprint" "Capacitor_SMD:C_0402_1005Metric" (at 100.33 95.25 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Datasheet" "" (at 100.33 95.25 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Description" "" (at 100.33 95.25 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(pin "1" (uuid "32b3a373-61a6-563b-a411-19c849e1ae47"))
+		(pin "2" (uuid "f9561ed0-6227-5d01-8a2e-9ce824637de9"))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55/5efffb63-edbb-5986-86d3-84ead412bc65" (reference "C_PPS") (unit 1))))
+	)
+	(global_label "+3V3_AUX"
+		(shape input)
+		(at 100.33 91.44 0)
+		(effects (font (size 1.27 1.27)) (justify left))
+		(uuid "5cd3079f-333c-5051-8f83-852b7bf5d85b")
+	)
+	(symbol
+		(lib_id "power:GND")
+		(at 100.33 99.06 0)
+		(unit 1)
+		(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)
+		(uuid "422ec18f-9697-5423-a10f-0e04a697658e")
+		(property "Reference" "#PWRC_PPS2" (at 100.33 102.06 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Value" "GND" (at 100.33 101.06 0) (effects (font (size 1.27 1.27))))
+		(property "Footprint" "" (at 100.33 99.06 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Datasheet" "" (at 100.33 99.06 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(pin "1" (uuid "2a23c7de-328c-5fc7-8008-4f91a4374ca6"))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55/5efffb63-edbb-5986-86d3-84ead412bc65" (reference "#PWRC_PPS2") (unit 1))))
+	)
+	(symbol
+		(lib_id "Device:C")
+		(at 69.85 95.25 0)
+		(unit 1)
+		(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)
+		(uuid "f69070b4-27bb-5123-995b-1bcd40a2ac1f")
+		(property "Reference" "C_GPS" (at 72.39 94.25 0) (effects (font (size 1.27 1.27)) (justify left)))
+		(property "Value" "10u" (at 72.39 96.25 0) (effects (font (size 1.27 1.27)) (justify left)))
+		(property "Footprint" "Capacitor_SMD:C_0603_1608Metric" (at 69.85 95.25 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Datasheet" "" (at 69.85 95.25 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Description" "" (at 69.85 95.25 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(pin "1" (uuid "bd0e3c17-a76b-5372-badd-1b2f9e849915"))
+		(pin "2" (uuid "a8c446db-7686-5485-b6bd-ceb0a29e779c"))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55/5efffb63-edbb-5986-86d3-84ead412bc65" (reference "C_GPS") (unit 1))))
+	)
+	(global_label "+3V3_AUX"
+		(shape input)
+		(at 69.85 91.44 0)
+		(effects (font (size 1.27 1.27)) (justify left))
+		(uuid "ab58bfa2-a9d9-5414-993a-6fd5aaf6218a")
+	)
+	(symbol
+		(lib_id "power:GND")
+		(at 69.85 99.06 0)
+		(unit 1)
+		(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)
+		(uuid "4f1bc8a1-6fed-5585-99e9-762c65b4838f")
+		(property "Reference" "#PWRC_GPS2" (at 69.85 102.06 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Value" "GND" (at 69.85 101.06 0) (effects (font (size 1.27 1.27))))
+		(property "Footprint" "" (at 69.85 99.06 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Datasheet" "" (at 69.85 99.06 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(pin "1" (uuid "a71f135c-ae41-5218-aa40-00fcf83a461f"))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55/5efffb63-edbb-5986-86d3-84ead412bc65" (reference "#PWRC_GPS2") (unit 1))))
+	)
+	(symbol
+		(lib_id "Device:R")
+		(at 139.7 80.01 0)
+		(unit 1)
+		(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)
+		(uuid "249ff202-abac-547f-bce5-9b1af41e5ce6")
+		(property "Reference" "R_PPS" (at 142.23999999999998 79.01 0) (effects (font (size 1.27 1.27)) (justify left)))
+		(property "Value" "33" (at 142.23999999999998 81.01 0) (effects (font (size 1.27 1.27)) (justify left)))
+		(property "Footprint" "Resistor_SMD:R_0402_1005Metric" (at 139.7 80.01 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Datasheet" "" (at 139.7 80.01 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Description" "" (at 139.7 80.01 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(pin "1" (uuid "7bb99321-fcc6-5c6a-980b-49f4c1a8b53c"))
+		(pin "2" (uuid "1be0babc-6c15-5a07-bfb9-01f0fc283e8b"))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55/5efffb63-edbb-5986-86d3-84ead412bc65" (reference "R_PPS") (unit 1))))
+	)
+	(label "PPS_CLEAN"
+		(at 139.7 76.2 0)
+		(effects (font (size 1.27 1.27)) (justify left))
+		(uuid "786de885-8592-5bc4-b433-18e1f446c835")
+	)
+	(global_label "SYNC_OUT"
+		(shape input)
+		(at 139.7 83.82 0)
+		(effects (font (size 1.27 1.27)) (justify left))
+		(uuid "4a24c9e0-9fb6-5321-8787-6d8effa2b992")
+	)
+	(symbol
+		(lib_id "Connector_Generic:Conn_01x02")
+		(at 170.18 74.93 0)
+		(unit 1)
+		(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)
+		(uuid "33a1c6f2-b3c6-5ea1-bd56-e80289fa59d9")
+		(property "Reference" "J_PPS1" (at 172.72 73.93 0) (effects (font (size 1.27 1.27)) (justify left)))
+		(property "Value" "PPS_tap_UWB" (at 172.72 75.93 0) (effects (font (size 1.27 1.27)) (justify left)))
+		(property "Footprint" "Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical" (at 170.18 74.93 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Datasheet" "" (at 170.18 74.93 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Description" "" (at 170.18 74.93 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(pin "1" (uuid "3768e981-1d1d-5ded-ab23-1679745916db"))
+		(pin "2" (uuid "684982a3-7873-5e6a-b695-a6935354ff2b"))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55/5efffb63-edbb-5986-86d3-84ead412bc65" (reference "J_PPS1") (unit 1))))
+	)
+	(label "PPS_CLEAN"
+		(at 165.1 74.93 0)
+		(effects (font (size 1.27 1.27)) (justify left))
+		(uuid "fe60af27-5505-5d53-8d8a-70ac6e710fa5")
+	)
+	(symbol
+		(lib_id "power:GND")
+		(at 165.1 77.47 0)
+		(unit 1)
+		(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)
+		(uuid "132d501c-0959-591c-8fde-5c570e4eed1b")
+		(property "Reference" "#PWRJ_PPS12" (at 165.1 80.47 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Value" "GND" (at 165.1 79.47 0) (effects (font (size 1.27 1.27))))
+		(property "Footprint" "" (at 165.1 77.47 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Datasheet" "" (at 165.1 77.47 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(pin "1" (uuid "13197402-e8f1-5350-ac79-c6df42a63630"))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55/5efffb63-edbb-5986-86d3-84ead412bc65" (reference "#PWRJ_PPS12") (unit 1))))
+	)
+	(symbol
+		(lib_id "Connector_Generic:Conn_01x02")
+		(at 170.18 90.17 0)
+		(unit 1)
+		(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)
+		(uuid "3139dfd8-45cc-5d23-9267-1690860aef1d")
+		(property "Reference" "J_PPS2" (at 172.72 89.17 0) (effects (font (size 1.27 1.27)) (justify left)))
+		(property "Value" "PPS_tap_scope" (at 172.72 91.17 0) (effects (font (size 1.27 1.27)) (justify left)))
+		(property "Footprint" "Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical" (at 170.18 90.17 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Datasheet" "" (at 170.18 90.17 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Description" "" (at 170.18 90.17 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(pin "1" (uuid "4b9fd1a1-742a-5e6c-a940-8247ed9843ad"))
+		(pin "2" (uuid "2fa66511-bd79-5dc8-9721-c11cc9e610c4"))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55/5efffb63-edbb-5986-86d3-84ead412bc65" (reference "J_PPS2") (unit 1))))
+	)
+	(label "PPS_CLEAN"
+		(at 165.1 90.17 0)
+		(effects (font (size 1.27 1.27)) (justify left))
+		(uuid "883f9a6b-fc3b-5042-8915-45a5b2b27c9e")
+	)
+	(symbol
+		(lib_id "power:GND")
+		(at 165.1 92.71 0)
+		(unit 1)
+		(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)
+		(uuid "fcf251ff-d387-5fca-9725-9d4ba93544a2")
+		(property "Reference" "#PWRJ_PPS22" (at 165.1 95.71 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Value" "GND" (at 165.1 94.71 0) (effects (font (size 1.27 1.27))))
+		(property "Footprint" "" (at 165.1 92.71 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(property "Datasheet" "" (at 165.1 92.71 0) (effects (font (size 1.27 1.27)) (hide yes)))
+		(pin "1" (uuid "0a7181d0-5843-5e80-a044-bc6126797b29"))
+		(instances (project "CM5IO" (path "/e63e39d7-6ac0-4ffd-8aa3-1841a4541b55/5efffb63-edbb-5986-86d3-84ead412bc65" (reference "#PWRJ_PPS22") (unit 1))))
+	)
+	(sheet_instances
+		(path "/"
+			(page "6")
+		)
+	)
+)
diff --git a/tools/build_gps.py b/tools/build_gps.py
new file mode 100644
index 0000000..28af3b0
--- /dev/null
+++ b/tools/build_gps.py
@@ -0,0 +1,166 @@
+#!/usr/bin/env python3
+"""build_gps.py — generate the CM5-carrier GPS + PPS distribution sheet.
+
+Same connectivity model as build_power.py: every pin gets a coincident named
+label / GND symbol / no_connect; nets form by name (grid-snapped 1.27mm).
+
+Frozen spec (CM5_Carrier_Pinout_BOM.md §6, CM5_Carrier_Design.md §5a):
+  J_GPS(5-pin): 1=PPS  2=NMEA_RX(GPS TX -> CM5 GPIO5/UART2 RX)
+                3=NMEA_TX(CM5 GPIO4/UART2 TX -> GPS RX)  4=+3V3_AUX  5=GND
+  GPS_PPS_RAW -> TVS -> 74LVC1G17 Schmitt (3V3) -> PPS_CLEAN
+    -> Rs 33R -> SYNC_OUT (CM5 pin 18, Ethernet_SYNC_OUT, 3.3V bidi, cfg input)
+    -> J_PPS1 (UWB tap) / J_PPS2 (scope tap), 2-pin each
+  Board is always a PPS SINK (GPS-sourced).
+
+Cross-sheet nets are GLOBAL: +3V3_AUX (Power sheet flag drives it), and
+GPIO4/GPIO5/SYNC_OUT (their CM5_GPIO local labels were converted to global —
+net names unchanged; nothing else in the design used those names).
+J_GPS pins 1/2 are re-typed 'output' (the GPS module drives PPS and TX into
+the board) so the analyzer's no_driver gate sees real drivers (E-key lesson).
+"""
+import re, sys, os, uuid as uuidlib
+
+ROOT_UUID = "e63e39d7-6ac0-4ffd-8aa3-1841a4541b55"
+PROJECT = "CM5IO"
+KSS = "/Applications/KiCad/KiCad.app/Contents/SharedSupport/symbols"
+HERE = os.path.dirname(os.path.abspath(__file__))
+CARRIER = os.path.join(HERE, "..", "carrier")
+
+def U(label): return str(uuidlib.uuid5(uuidlib.NAMESPACE_DNS, "cm5carrier-gps-" + label))
+SHEET_SYMBOL_UUID = U("sheet-symbol")
+SHEET_FILE_UUID = U("sheet-file")
+
+def g(v): return round(round(v / 1.27) * 1.27, 2)
+
+def paren_end(t, s):
+    d = 0
+    for i in range(s, len(t)):
+        if t[i] == '(': d += 1
+        elif t[i] == ')':
+            d -= 1
+            if d == 0: return i + 1
+    raise ValueError("unbalanced")
+
+def get_symbol(text, name):
+    m = re.search(r'\(symbol\s+"' + re.escape(name) + r'"', text)
+    return text[m.start():paren_end(text, m.start())] if m else None
+
+def lib_pins(seg):
+    out = {}
+    for pm in re.finditer(r'\(pin\b', seg):
+        s = pm.start(); ps = seg[s:paren_end(seg, s)]
+        at = re.search(r'\(at\s+([\d.-]+)\s+([\d.-]+)\s+([\d.-]+)\)', ps)
+        nu = re.search(r'\(number\s+"([^"]+)"', ps)
+        if at and nu:
+            out.setdefault(nu.group(1), (float(at.group(1)), float(at.group(2)), float(at.group(3))))
+    return out
+
+def set_pin_type(seg, number, newtype):
+    for pm in re.finditer(r'\(pin\s+(\w+)\s+(\w+)', seg):
+        s = pm.start(); blk = seg[s:paren_end(seg, s)]
+        if re.search(r'\(number\s+"' + re.escape(number) + r'"', blk):
+            head = re.match(r'\(pin\s+\w+', blk).group(0)
+            return seg[:s] + blk.replace(head, f'(pin {newtype}', 1) + seg[s + len(blk):]
+    return seg
+
+# ---- lib_symbol sources -----------------------------------------------------------
+carrier_hs = open(os.path.join(CARRIER, "CM5_HighSpeed.kicad_sch")).read()
+LIBS = {}
+def add_from(lib_id, srctext, srcname=None, retype=None):
+    srcname = srcname or lib_id.split(':')[-1]
+    blk = get_symbol(srctext, lib_id) or get_symbol(srctext, srcname)
+    if not blk: sys.exit("missing lib_symbol " + lib_id)
+    if ('"' + lib_id + '"') not in blk[:60]:
+        blk = blk.replace('(symbol "' + srcname + '"', '(symbol "' + lib_id + '"', 1)
+    for num, ty in (retype or {}).items():
+        blk = set_pin_type(blk, num, ty)
+    LIBS[lib_id] = (blk, lib_pins(blk))
+
+for lid in ["Device:R", "Device:C", "power:GND"]:
+    add_from(lid, carrier_hs)
+add_from("Device:D_TVS", open(f"{KSS}/Device.kicad_sym").read(), "D_TVS")
+# GPS module DRIVES pins 1 (PPS) and 2 (its TX) -> 'output' for driver-aware checks
+add_from("Connector_Generic:Conn_01x05", open(f"{KSS}/Connector_Generic.kicad_sym").read(),
+         "Conn_01x05", retype={'1': 'output', '2': 'output'})
+add_from("Connector_Generic:Conn_01x02", open(f"{KSS}/Connector_Generic.kicad_sym").read(), "Conn_01x02")
+add_from("74xGxx:74LVC1G17", open(f"{KSS}/74xGxx.kicad_sym").read(), "74LVC1G17")
+
+GLOBAL_NETS = {"+3V3_AUX", "GPIO4", "GPIO5", "SYNC_OUT"}
+HIER_NETS = set()
+
+# ---- placement engine (same as build_power.py, + ('nc',) pins) --------------------
+body = []
+def emit_label(net, x, y, ang=0):
+    body.append(f'\t(label "{net}"\n\t\t(at {x} {y} {ang})\n'
+                f'\t\t(effects (font (size 1.27 1.27)) (justify left))\n\t\t(uuid "{U("l-"+net+f"-{x}-{y}")}")\n\t)\n')
+def emit_glabel(net, x, y, ang=0):
+    body.append(f'\t(global_label "{net}"\n\t\t(shape input)\n\t\t(at {x} {y} {ang})\n'
+                f'\t\t(effects (font (size 1.27 1.27)) (justify left))\n\t\t(uuid "{U("gl-"+net+f"-{x}-{y}")}")\n\t)\n')
+def emit_nc(x, y, tag):
+    body.append(f'\t(no_connect (at {x} {y}) (uuid "{U("nc-"+tag)}"))\n')
+def emit_gnd(x, y, tag):
+    body.append(f'\t(symbol\n\t\t(lib_id "power:GND")\n\t\t(at {x} {y} 0)\n\t\t(unit 1)\n'
+                f'\t\t(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)\n\t\t(uuid "{U("gnd-"+tag)}")\n'
+                f'\t\t(property "Reference" "#PWR{tag}" (at {x} {y+3} 0) (effects (font (size 1.27 1.27)) (hide yes)))\n'
+                f'\t\t(property "Value" "GND" (at {x} {y+2} 0) (effects (font (size 1.27 1.27))))\n'
+                f'\t\t(property "Footprint" "" (at {x} {y} 0) (effects (font (size 1.27 1.27)) (hide yes)))\n'
+                f'\t\t(property "Datasheet" "" (at {x} {y} 0) (effects (font (size 1.27 1.27)) (hide yes)))\n'
+                f'\t\t(pin "1" (uuid "{U("gp-"+tag)}"))\n'
+                f'\t\t(instances (project "{PROJECT}" (path "/{ROOT_UUID}/{SHEET_SYMBOL_UUID}" (reference "#PWR{tag}") (unit 1))))\n\t)\n')
+
+def place(lib_id, ref, value, footprint, ox, oy, pin_nets):
+    ox, oy = g(ox), g(oy)
+    _, pins = LIBS[lib_id]
+    extra = ('\t\t(property "Description" "" (at %g %g 0) (effects (font (size 1.27 1.27)) (hide yes)))\n' % (ox, oy))
+    sym = (f'\t(symbol\n\t\t(lib_id "{lib_id}")\n\t\t(at {ox} {oy} 0)\n\t\t(unit 1)\n'
+           f'\t\t(exclude_from_sim no) (in_bom yes) (on_board yes) (dnp no)\n\t\t(uuid "{U("sym-"+ref)}")\n'
+           f'\t\t(property "Reference" "{ref}" (at {ox+2.54} {oy-1} 0) (effects (font (size 1.27 1.27)) (justify left)))\n'
+           f'\t\t(property "Value" "{value}" (at {ox+2.54} {oy+1} 0) (effects (font (size 1.27 1.27)) (justify left)))\n'
+           f'\t\t(property "Footprint" "{footprint}" (at {ox} {oy} 0) (effects (font (size 1.27 1.27)) (hide yes)))\n'
+           f'\t\t(property "Datasheet" "" (at {ox} {oy} 0) (effects (font (size 1.27 1.27)) (hide yes)))\n' + extra)
+    for num in sorted(pins, key=lambda n: int(re.sub(r'\D', '', n) or 0)):
+        sym += f'\t\t(pin "{num}" (uuid "{U("p-"+ref+"-"+num)}"))\n'
+    sym += f'\t\t(instances (project "{PROJECT}" (path "/{ROOT_UUID}/{SHEET_SYMBOL_UUID}" (reference "{ref}") (unit 1))))\n\t)\n'
+    body.append(sym)
+    for num, net in pin_nets.items():
+        lx, ly, _ = pins[num]; px, py = round(ox + lx, 2), round(oy - ly, 2)
+        if net == ('gnd',): emit_gnd(px, py, ref + num)
+        elif net == ('nc',): emit_nc(px, py, ref + num)
+        elif isinstance(net, tuple) and net[0] == 'global': emit_glabel(net[1], px, py)
+        elif net in GLOBAL_NETS: emit_glabel(net, px, py)
+        else: emit_label(net, px, py)
+    return ox, oy
+
+GND = ('gnd',); NC = ('nc',)
+
+# ---- the GPS + PPS block ----------------------------------------------------------
+place("Connector_Generic:Conn_01x05", "J_GPS", "GPS_5pin_PPS_UART", "Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical",
+      60, 80, {'1': 'GPS_PPS_RAW', '2': 'GPIO5', '3': 'GPIO4', '4': '+3V3_AUX', '5': GND})
+place("Device:D_TVS", "TVS_PPS", "PESD3V3L1BA", "Diode_SMD:D_SOD-323", 85, 95, {'1': 'GPS_PPS_RAW', '2': GND})
+# 74LVC1G17: 1=NC 2=A 3=GND 4=Y 5=VCC (KiCad lib types: input/power_in/output/power_in)
+place("74xGxx:74LVC1G17", "U_PPS", "74LVC1G17", "Package_TO_SOT_SMD:SOT-23-5",
+      110, 80, {'2': 'GPS_PPS_RAW', '4': 'PPS_CLEAN', '5': '+3V3_AUX', '3': GND, '1': NC})
+place("Device:C", "C_PPS", "100n", "Capacitor_SMD:C_0402_1005Metric", 100, 95, {'1': '+3V3_AUX', '2': GND})
+place("Device:C", "C_GPS", "10u", "Capacitor_SMD:C_0603_1608Metric", 70, 95, {'1': '+3V3_AUX', '2': GND})
+# series R guards the LVC1G17 output against a driver fight (CM5 pin 18 is bidi;
+# board policy configures it as input — spec Rs 33-100R, pick 33R)
+place("Device:R", "R_PPS", "33", "Resistor_SMD:R_0402_1005Metric", 140, 80, {'1': 'PPS_CLEAN', '2': 'SYNC_OUT'})
+place("Connector_Generic:Conn_01x02", "J_PPS1", "PPS_tap_UWB", "Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical",
+      170, 75, {'1': 'PPS_CLEAN', '2': GND})
+place("Connector_Generic:Conn_01x02", "J_PPS2", "PPS_tap_scope", "Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical",
+      170, 90, {'1': 'PPS_CLEAN', '2': GND})
+
+# ---- file scaffold ----------------------------------------------------------------
+libsyms = "\n".join(blk for blk, _ in LIBS.values())
+sheet = ('(kicad_sch\n\t(version 20231120)\n\t(generator "eeschema")\n\t(generator_version "8.0")\n'
+         f'\t(uuid "{SHEET_FILE_UUID}")\n\t(paper "A4")\n'
+         '\t(title_block\n\t\t(title "CM5 Carrier - GPS + PPS distribution")\n\t\t(rev "A")\n'
+         '\t\t(comment 1 "GPS conn (PPS+UART2+3V3_AUX) -> TVS -> LVC1G17 -> CM5 SYNC + 2 taps; PPS sink only")\n\t)\n'
+         '\t(lib_symbols\n' + libsyms + '\n\t)\n' + "".join(body) +
+         '\t(sheet_instances\n\t\t(path "/"\n\t\t\t(page "6")\n\t\t)\n\t)\n)\n')
+assert sheet.count('(') == sheet.count(')'), f"UNBALANCED {sheet.count('(')} vs {sheet.count(')')}"
+print("sheet-symbol uuid:", SHEET_SYMBOL_UUID)
+print("parens balanced:", sheet.count('('))
+out = os.path.join(CARRIER, "GPS_PPS.kicad_sch")
+if '--apply' in sys.argv: open(out, 'w').write(sheet); print("WROTE " + out)
+else: print("DRY RUN (--apply to write)")