A boat install shouldn't give you too many problems. A couple of things worth considering:-
Run a *very* heavy ground cable back to your battery, and use this for both the Empeg and the amp (use a cable rated at least double the total combined current of the Empeg and amp). Earth the RCA grounding leads first of all to the amp ground terminal - if you get noise problems, try relocating these to the same heavy earth feed.
Run your RCA cables as far away from any existing power cables as possible - probably your best plan would be to mount the amp and Empeg as close together as you can get them.
Watch out for overvoltage - if you're running an outboard, the charging circuits on some of these can be a bit less than perfect. I'm not sure how well Hugo protected the Empeg from overvoltage, but either way, hanging an additional zener diode off the feed to the Empeg between the unit itself and the fuseholder probably isn't a bad idea. Mail me anytime if you'd like me to explain that a bit better.
You might need to suppress other electrical units on an individual basis - depending on how expensive the boat is, the level of supression on most varies from poor to non-existant, but most bits aren't normally too hard to supress. If you've got VHF gear on board, keeping the Empeg as far away from that as possible is also a good idea.
Anything else you need to know - feel free to mail me - I actually started out working on boats many years back....
Dominic
Cambridge Car Audio
http://www.cambscaraudio.co.uk