A differing horn blast in reply means that, for whatever reason, the fishing boat is not ready for you to pass. Either wait until they are ready (and communicate with them via radio in the meantime), or find a different route. International rules require 2 long (4-6) second blasts plus 2 short blasts for portside passing. For starboard passing, the signal is 2 long and 1 short blast.
In addition, put your boat into neutral as you pass to avoid clipping any lines or nets with your propellers.
The hierarchy of right of way is as follows (from highest to lowest priority): Vessels being passed by other vessels Commercial towing vessels and vessels with restricted maneuverability Sailing or non-powered vessels (those without motors) Powered vessels with full maneuverability
In maritime interactions, the boat that will be maintaining its course and speed is called the “stand-on” vessel. The boat taking action is called the “give-way” vessel, and has a responsibility to make its move safely and with consideration for the stand-on vessel.
If port-side passing isn’t possible, the vessels are expected to pass on their starboard sides, and issue 2 short honks in agreement.
In low-visibility situations, sound your horn often to alert other boats to your presence.
