one prolonged blast
In restricted visibility, a power-driven vessel underway is required to sound one prolonged blast every 2 minutes. This signal is meant to indicate the vessel's presence to other nearby vessels in low visibility conditions. The prolonged blast lasts for about 4 to 6 seconds. This sound signal helps enhance safety by alerting others to the vessel's location, allowing for better navigation and collision avoidance.
A vessel at anchor or aground in restricted visibility
one prolonged blast
one prolonged blast
one prolonged blast
One prolonged blast
One prolonged blast
one prolonged blast
A bell ringing rapidly for 5 seconds every minute is the signal for a vessel at anchor in restricted visibility.
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.
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.