thanks for the replies - I didn't catch up sooner as I thought I'd be getting subscription emails about replies....
I thought about just using my HT but thought the audio from an ear phone would be too crappy. I see Yaesu has a waterproof mobile vhf/uhf with a detachable face plate. My buddy just bought onee and we'll be installing it on his crotch rocket on Saturday - maybe I'll get some more ideas...
TNX, Andrew