Re: Installing sound system
What components are you transferring? Head unit, amps, speakers?
Where are you installing it? Inside the cabin, outside, exposure to elements?
The good news it'll work as it's all 12V and interchangeable (same 4 ohm impedence)
I believe the real difference between car audio and marine grade audio is that the internal components are shielded from moisture better in marine grade equipment. Also, for your deck if exposed to the elements should be installed in the dash box or covered with a waterproof plate to prevent major water damage.
Also, the speaker cone themselves tend to be paper based and won't stand up to the moisture as well as marine grade speakers and will quickly deteriorate.
I've seen it work well inside the cabin, but I don't know if you'd have similar success outside in the direct elements.
Lastly, if your adding amplifiers, etc, watch the draw on your battery. If you don't have a large enough power source and it's not recharged via generator or alternator (don't know the specs on your boat) you'll quickly drain your system.