A power-driven vessel navigating in restricted visibility must sound one prolonged blast every two minutes. This signal indicates its presence to other vessels in the vicinity. Additionally, vessels may also use other sound signals to indicate their intentions or maneuvers.
In restricted visibility, a power-driven vessel under way is required to sound one prolonged blast followed by two short blasts every two minutes. This signal helps to indicate the vessel's presence to other nearby vessels in low visibility conditions. The prolonged blast lasts for about four to six seconds, while the short blasts are approximately one second each.
Under restricted visibility, a power-driven vessel must sound one prolonged blast every two minutes. This signal is intended to alert other vessels in the area of its presence. Additionally, vessels may also be required to sound other signals depending on their specific maneuvers or circumstances.
One prolonged and two short blasts is 'D' in Morse signals. It is a signal to be used in restricted visibility by a vessel not under command[NUC], a vessel restricted in her ability to manoeuvre[RAM], a vessel constrained by her draught, a sailing vessel, a vessel engaged in fishing and a vessel engaged in towing or pushing another vessel.
one prolonged blast
lights must be on during periods of restricted visibility
one prolonged blast
One Prolonged Blast.
One Prolonged Blast.
one prolonged blast
one prolonged blast
One prolonged blast
Lights must be on during periods of restricted visibility. ref: EQ-2