Boats normally pass on the port (left) side. The other boater may use a signal horn.
it tells you the boat is approaching you head on
The danger signal
Slow to minimum speed
Slow to a minimum speed
Reduce speed to bare steerageway.
Slow to a minimum speed
Slow to a minimum speed
Slow to a minimum speed
Slow to a minimum speed
Slow to a minimum speed
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.
answer with same signal and continue maintain course and speed