Rule 35 is fairly complex, and also it is recommend to have a highlighter in hand while analysis through it.

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Fog, mist, fall snow, heavy rainstorms, sandstorms or any kind of other similar causes have the right to make problems that hamper visibility. Sound signals because that vessels in restricted visibility, whether underway, at anchor or aground, day or night, are the topic of dominance 35 (COLREGS). The bell and gong are added into the mix of whistle sounds offered as choices for limited visibility signals. Dominance 35 is reasonably complex, and also it is advised to have actually a highlighter in hand while analysis through it.

The rules of the roadway state when underway ‘vessels candlestick sound at intervals the not much more than two minutes’ the prescribed sound signal.

Why a two minute rule? A necessity for all vessels is to preserve a suitable look-out by sight and hearing. In minimal visibility, the 2 minutes allows the look-out to hear for sound signal from other vessels groping their way through the fog. COLREGS list the complying with sound signals because that vessels underway:

A power-driven courage making method shall sound one an extensive blast.A power-driven courage underway however stopped chandelier sound two prolonged blasts.A pilot vessel, engaged in pilotage duty, may also sound four quick blasts in addition to the sound signals forced by a power-driven vessel.Vessels that space encumbered, as result of their maneuverability or their ranking in the power structure of responsibilities in between vessels in preeminence 18, shall sound one an extensive blast complied with by two short blasts. These encumbered vessels space those not under command, limited in their capacity maneuver due to their work, constrained by draft, sailing, engaged in advertising fishing and towing or pushing an additional vessel.


With the big number the sound signals obtainable for usage in minimal visibility, remembering all the possibilities have the right to be difficult. Trying to easily look increase a sound signal heard in the fog by transforming to dominion 35 in COLREGS have the right to be a bit of a challenge.

A great alternative is come use among the countless laminated intuitive shorthand versions of COLREGS offered at ship chandleries.

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For sound signals, a Morse password dot represents the quick blast of about one-second duration. And a Morse code dash represents the prolonged blast of 4 to six seconds long.

Here’s the attach to reference the Related, dominance 34 describing maneuvering and warning for powered ship underweigh in international waters