33 CFR 174.23 : Navigation And Navigable Waters (§ 1.01-1 To Parts 404-499) — (§ 125.01 To Parts 188-199) — Coast Guard, Department Of Homeland Security (Continued) (§ 125.01 To Parts 188-199) — Boating Safety (§ 173.1 To Parts 188-199) — State Numbering And Casualty Reporting Systems (§ 174.1 To § 174.125) — Numbering System Requirements (§ 174.11 To § 174.31) — Form of number.