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§ 83.32 Definitions (Rule 32)

Inland Navigation Rules

(a) The word whistle means any sound signaling appliance capable of producing the prescribed blasts and which complies with specifications in Annex III to these Rules (33 CFR part 86).

(b) The term short blast means a blast of about 1 second's duration.

(c) The term prolonged blast means a blast of from 4 to 6 seconds' duration.

US Inland Navigation Rules current as of 22 October 2026. Official text: ecfr.gov.

A work of the US government, in the public domain. Reproduced from the eCFR (ecfr.gov), 33 CFR parts 83 to 88.