- 🇺🇸CRIMSON GEM 426 m 366984320 — US^0EA8 → 0XAB
- 🇺🇸CRIMSON GLORY 354 m 366984330 — US^0WK4 → 0X28
- 🇺🇸CRIMSON WHITE II 35 m 368273490 — —
- 🇱🇺CRISTOBAL COLON 213 m · Dredger 253373000 9429572 MAILIAO
- 🇺🇸CROCKETT 119 m 368078690 1292803 US^0U3E → 0R7E
- 🇳🇱CROSSER Dredger 244095368 — —
- 🇺🇸CROW ARROW 7 m · Port tender 366974070 — —
- 🇺🇸CROWN POINT 200 m 367645170 — PASCO WA
- 🇺🇸CROWN STAR 22 m 368245080 — —
- 🇳🇴CRUSH 12 m · Anti-pollution vessel 258010800 — —
- 🇺🇸CRYSTAL CUTLER 92 m 367469910 — US^0RV3 → 0XMU
- 🇺🇸CRYSTAL D TAYLOR 358 m 367522170 100503329 USUQM → USHBN
- 🇦🇺CS31 8 m · Search and rescue vessel 503161430 — —
- 🇻🇳CSB8002 90 m · Law enforcement vessel 574002620 9667710 DA NANG
- 🇭🇺CSEPEL 14 m · Search and rescue vessel 243042736 — CLASS B
- 🇺🇸CSS SAVANNAH 22 m · Search and rescue vessel 367004290 — CARLINE PLAQ FLT
- 🇺🇸CSS SHENANDOAH 177 m 368122650 — CARLINE 231 LMR
- 🇬🇧CT OXTON 19 m · Port tender 235000164 913629200 GBIMM
- 🇵🇹CTE CELSO MADEIRA 15 m · Pilot vessel 263441365 — CLASS B
- 🇵🇹CTE VALERIO ANDRADE Pilot vessel 255621000 — FUNCHAL
- 🇨🇦CTOW NANAIMO A 8 m · Search and rescue vessel 316041703 — CLASS B
- 🇬🇧CUAN VIEW 6 m · Search and rescue vessel 232065517 — CLASS B
- 🇦🇺CULGAROOL 8 m · Law enforcement vessel 503158730 — CLASS B
- 🇺🇸CULLEN LANDOLT 147 m 367012730 — US^0H9G → 0QPN
- 🇺🇸CULLEN PASENTINE — 367765140 — TX CITY
- 🇬🇧CULVERWELL 14 m · Pilot vessel 235058861 — CLASS B
- 🇺🇸CUMBERLAND HUNTER 348 m 367493870 — US^0ADX → 084J
- 🇺🇸CURLIN 22 m 368117020 — US^0SGB → 0SER
- 🇦🇺CURTIS ENDEAVOUR II 29 m 503639000 — —
- 🇺🇸CURTIS RANDOLPH 24 m · Search and rescue vessel 368056130 — CLASS B
- 🇺🇸CURTIS REINAUER 131 m 367549830 9653240 US NYC
- 🇳🇴CUSTOS 8 m · Search and rescue vessel 257123880 — —
- 🇺🇸CUTTER BOAT-LARGE 7 m · Search and rescue vessel 338926340 — —
- 🇺🇸CUTTER BOAT-LARGE 7 m · Search and rescue vessel 338926358 — —
- 🇺🇸CUTTER BOAT-LARGE 7 m · Search and rescue vessel 338926363 — —
- 🇺🇸CUTTER BOAT-LARGE 7 m · Search and rescue vessel 338926367 — —
- 🇺🇾CUTTER PATRIOTA Pilot vessel 770576523 — PILOT BOARDING
- 🇺🇸CY 207 m 367017960 8991023 US^0QRH → 0X1R
- 🇳🇱CYCLONE 9 8 m · Port tender 244110848 — CLASS B
- 🇨🇦CYGNUS 62 m · Search and rescue vessel 316017000 7927831 SEA
- 🇺🇸CYNTHIA K 117 m 368099320 1294530 US^0R3N → 0YLZ
- 🇵🇱CZESLAW II 22 m · Search and rescue vessel 261000090 — —
- 🇵🇱CZSZ-BENTAL 7 m · Dredger 261011718 — —
- 🇵🇱CZSZ-KRASNAL 30 m · Dredger 261012322 — —
- 🇵🇱CZSZ-LUNDI 40 m · Dredger 261185762 7726782 GDYNIA
- 🇵🇱CZSZ-TROLL 42 m · Dredger 261185774 7235549 GDYNIA
- 🇺🇸D A GRIMM 36 m 367434610 — US^0CL1 → 0C4G
- 🇺🇸D. DWAINE STEPHENS 288 m 368103540 — US^0E9B → 0X9W
- 🇨🇦D. REID 61 m · Dredger 316058931 — —
- 🇺🇾D11-21 DE JULIO 91 m · Dredger 770576466 9828742 —
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