This site contains affiliate links for which we may be compensated.
Uniden MHS050 2.5W Waterproof Floating VHF Marine Radio$168.88
Not just waterproof, this product is completely submersible. It also floats! It is the ideal handheld transceiver for really wet outdoor activities, such as jet steering, open tinnies etc. you can select output power between 1 and 2.5 watts to conserve batteries when in continuous use.
It automatically monitors CH16 and while you are monitoring a selected channel. Fantastic!