Hi. You donít say what size or type of boat
or what is your cruising speed. Can you have a lookout forward at night. They are acoustic mammals. Not sure a depth sounder
will wake them. No science on this in the ocean.
Sometimes you can smell them...whalers wrote this.
Chances are pretty low. I wouldnít be overly concerned unless you hit a sperm whale. Whalers log books
might give you some local knowledge.
There are marine
mammal experts in every university. Might ask there.
If you hit a manatee, they just throw beer
cans at you, but Dugongs might have more firepower.
Watch out for the fierce bad orcas...they get their kraken friends to break your rudder
and drag you under... never to be seen again. :nonono
Happy trails to you.
Mark and his manatee crew trying to pronounce Dew Gong correctly.