Rule 35 is relatively complex, and it is advised to have actually a highlighter in hand while reading through it.

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Fog, mist, fallout’s 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 minimal visibility, whether underway, in ~ anchor or aground, work or night, space the subject of ascendancy 35 (COLREGS). The bell and also gong are added into the mix of horn sounds offered as alternatives for limited visibility signals. Preeminence 35 is fairly complex, and it is advised to have actually a highlighter in hand while analysis through it.

The rule of the roadway state once underway ‘vessels candlestick sound in ~ intervals the not much more than two minutes’ the prescribed sound signal.

Why a 2 minute rule? A requirement for all vessels is to maintain a appropriate look-out by sight and also hearing. In limited visibility, the 2 minutes allows the look-out to hear for sound signal from other vessels groping their method through the fog. COLREGS list the following sound signals for vessels underway:

A power-driven courage making means shall sound one prolonged blast.A power-driven ship underway yet stopped shall sound two an extensive blasts.A pilot vessel, engaged in pilotage duty, may additionally sound four brief blasts in enhancement to the sound signals required by a power-driven vessel.Vessels that room encumbered, as result of their maneuverability or their ranking in the pecking order of responsibilities in between vessels in ascendancy 18, chandelier sound one prolonged blast followed by two brief blasts. This encumbered vessels space those not under command, restricted in their capability maneuver as result of their work, constrained through draft, sailing, involved in advertisement fishing and also towing or pushing another vessel.


With the large number of sound signals obtainable for usage in minimal visibility, remembering all the possibilities have the right to be difficult. Do the efforts to quickly look up a sound signal heard in the fog by transforming to dominance 35 in COLREGS can be a little bit of a challenge.

A an excellent alternative is come use one of the many laminated visual shorthand version of COLREGS marketed at ship chandleries.

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For sound signals, a Morse code dot represents the short blast of around one-second duration. And a Morse password dash represents the an extensive blast of 4 to six secs long.

Here’s the connect to referral the Related, dominance 34 describing maneuvering and warning for powered ship underweigh in global waters