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Boating All Out

In article ,
says...

On Thu, 3 Mar 2011 10:48:14 -0800 (PST), Frogwatch
wrote:

Would this work?
Put a water soaked blanket on the deck (or over the cabin). It would
cool the surface below by evaporation in sunlight. When the water
evaporated, you'd pour more water onto it. If salt water, you'd have
to pour enough to remove the salt left behind by evaporation.

Your best bet is to use enough shades and awnings to keep sunlight
from reaching the deck and cabin top in the first place.

Right. But evaporative cooling is a pretty low cost cooling solution.
Might be easier to attach a cloth than rig a shade on areas that aren't
normally shaded.
Evaporation works at night too if high humidity doesn't hamper it.
Whether it's practical on a sailboat is another issue.
A lightweight fabric tailored to fit and attach might be useful.
You'd use power for a pump to keep it wet.
Unless you can do that by something hung in the in water working
by capillary action.
It's going to salt up, but you can shake that out when it's dry.
You could test its effectiveness with a cheap fabric, a good
thermometer, and a bucket on a rope.