"Rugged radios" makes a little handheld unit the Rh-5r that I picked up for just over $100 in a kit with a larger battery and long antenna. It's a dual band vhf/uhf that has a 5 watt output. Great little race radio that is super compact and I even use it as a police scanner when not at a race or wheeling.
I looked into the marine radios, but most of them only have the 16 or so preset frequencies, where a good race radio can be tuned to any frequency manually.
The rh-5r even has a built in flashlight and fm radio. Pretty cool, and I don't go anywhere without it.
http://www.ruggedradios.com/index.php?main_page=product_info&products_id=1274