No reason you can't.
Just be careful w/ water around it.
Get a good cover and install if it does not already have one.
Also be aware that if it has presets and a clock it can run the battery down
over time. A couple weeks is no big deal but a month or more will drain a
battery.
Recommend installing a switch if you don't already have one so you can kill
all power to the radio when not using the boat.

--
Tony
my boats at http://t.thomas.home.mchsi.com

"Melandre" wrote in message
...
I just bought a used 1990 Bayliner Capri. It came with an AM-FM
cassette deck but only am-fm is working.

From an electrical viewpoint, is therre any reason I couldn"t simply
install a regular car deck in my boat?

Andre
Bayliner Capri 1850