COLREG Rule 32
Rule 32. Definitions
Rule 32. Definitions
(a) The word "whistle" means any sound signalling appliance capable of producing the prescribed blasts and which complies with the specifications in annex III to these Regulations.
(b) The term "short blast" means a blast of about one second's duration.
(c) The term "prolonged blast" means a blast of from four to six seconds' duration.
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