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You should already be aware of a boat approaching from astern ... your head needs to be on a swivel as the pilot at all times. You need to know everything about your surroundings. If you hear this signal you should probably slow down and let them pass safely. Don't crowd them or try to out run them.
If another boat signals their intention to pass you from astern, you should answer with the same signal if in agreement and maintain course and speed.
you go and read the manual and then take your test
Move to the right or left and let them pass
five or more short blasts
answer with same signal and continue maintain course and speed
Use hand signals.
The purpose of vehicle signalling is to alert other traffic as to your intentions. Given this, every time you intend to depart from the (in NZ) "keep to the left" rule you should use your traffic signals.
Depending on which side they intend to pass you on, they should give you and audible horn blast. One blast indicates passing on the starboard and tow blasts indicate passing on the port. Remember to return the same audible horn signal to let them know that you heard them and are aware of their intentions. One blast from them gets one blast from you and so on. The vessel being passed will remain the Stand - on vessel, which means you do not alter your course or speed. They, being the Give-way vessel must alter speed and course to pass.
Depending on which side they intend to pass you on, they should give you and audible horn blast. One blast indicates passing on the starboard and tow blasts indicate passing on the port. Remember to return the same audible horn signal to let them know that you heard them and are aware of their intentions. One blast from them gets one blast from you and so on. The vessel being passed will remain the Stand - on vessel, which means you do not alter your course or speed. They, being the Give-way vessel must alter speed and course to pass.
Its intentions
Check your mirrors and signal your intentions.