I picked up a Lowrance Link-2 VHF/GPS Handheld Radio, ~$200
It's a solid waterproof floating radio with high ratings. It is also supposed to interface with the Lowrance Elite 4x DSI Fish finder, which I also recently purchased, but have yet to verify the two together.
Here's some of the info. The rest of the specs are on the ads on ebay or websites that sell it.
Handheld Class D DSC-compliant Marine VHF Radio with Built-in GPS. Floating handheld VHF radio that is Class D DSC compliant and features Man Over Board functionality and storage for up to 300 waypoints. It is full Class-D DSC enabled VHF and has digital selective calling (DSC) capacity that meets the United States Coast Guard standard for all recreational vessels.
- Large 128 x 128 pixel LCD with adjustable contrast and backlighting
- Loud 700mW speaker for clear communication
- Easy-to use soft keys and push to talk button
- Fully waterproof and floats
- Battery life up to 11 hours (with GPS off)
- NMEA 0183 output from charger base
- Battery and charger meet new CEC smart-charger requirement introduced this year
- Meets ITU-R M.493-13 DSC regulation
- Convenient size to store in an emergency kit