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one prolonged blast
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.
One horn blast every two minutes.
One prolonged blast should be sounded every two minutes.