Sources

Every claim you read on CaptainsGround maps to one of these. We don’t generate facts from training data; we generate explanations from cited primary sources.

• 33 CFR — Navigation and Navigable Waters

  60 chunks · last ingested 2026-04-30

  Inland Navigation Rules + USCG operating rules.

  ecfr.gov · Title 33

• 46 CFR — Shipping

  278 chunks · last ingested 2026-04-30

  Subchapters T (small passenger vessels) and B (mariner credentialing).

  ecfr.gov · Title 46

• COLREGs (72 COLREGS)

  not ingested yet

  International Regulations for Preventing Collisions at Sea — 38 rules (annexes covered separately under 33 CFR).

  IMO · public domain

• Inland Navigation Rules

  not ingested yet

  Parallel set of rules for inland US waters; codified at 33 CFR Subchapter E.

  33 CFR §83

• Bowditch — American Practical Navigator

  not ingested yet

  NGA. Public domain. Reference for celestial, dead reckoning, charts.

  NGA Pub. 9

• USCG Boatswain's / Coxswain's Mate manuals

  not ingested yet

  Public-domain US Coast Guard training texts.

  USCG · public domain

• Light List & Buoy Chart Symbols

  not ingested yet

  USCG Light List + Chart No. 1 buoy and aid symbols.

  USCG · public domain