The Other Mike wrote:

Switches that don't protrude are better if there is any chance of
falling against them or they come close to your face when in a bunk so
normal toggle switches are usually a no-no except when situated under
a cover panel.

All very well but a "switch that doesn't protrude" has to have zero
thickness if it's mounted on a panel which is a parition between two
exposed areas.


Depending on the exposure to the elements pick the highest IP rating
you can justify (and afford) from a reputable manufacturer, use
crimped ring terminals with adhesive heatshrink round the cable end
(rather than push on 1/4 inch crimps) with a smear of silicone grease
on all the terminals both used and unused.

This is a boat for inland waterways, as far as I can tell so far
(we've owned it for a year) the environment is very similar to our
house in the countrysid in the UK not so far from the sea.

--
Chris Green