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ok, your camera is seeing enough water for saying if the object is close of not to the boat. Try what I have mentioned:

You can detect the boat, the other object and the distance on water between them. try to interpret the distance on a log scale and set a threshold like if the converted distance (as exp(dist)) is smaller than it, the object is close.

HINT: you can have 2 areas: front and side for different actions...

Try a first version and come back if you get stocked.