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.
Maintain course and speed to allow the faster boat to pass safely.
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.
the boat is going astern. (backwards)
answer with same signal and continue maintain course and speed
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.
Proper procedure for using hand held visual distress signal flare
3 blasts on the horn says you are going astern
A boat is astern propulsion and is in the act of backing up
A boat is using astern propulsion and is in the act of backing up.
When you see green and white lights on another boat, you should slow down. This means that you are approaching another boat and you should reduce your speed.
You should keep a good look out in order to avoid colliding with another boat.