What sound signal should be given if you approach another
Power Driven vessel head on and wish to pass it on its starboard side?
If it is not possible to pass port-to-port, due to an obstruction or shoreline, a starboard-to-starboard pass should be signaled with two short blasts. Two short blasts should be returned from the approaching vessel, indicating its move to the port side. A must blow two short blasts and alter course to port. B must return two short blasts—to indicate understanding—and alter course to port.
Neither Power-driven A nor power-driven B gives way or stands on in a head-on encounter. Therefore, some communication is needed between A and B. The most common response in a head-on meeting between power-driven vessels is to signal an intention to pass port-to-port with one short blast. A short blast should be returned from the approaching vessel, indicating a move to the starboard side. A must blow one short blast and alter course to starboard, power-driven B must blow one short blast—to indicate understanding—and alter course to starboard.
