Standard Horizon makes a VHF that also uses the "family radio" frequencies. That same model is genuinely waterproof, about the size of a deck of cards and costs around $300. The booklet that comes with the radio gives the proper frequencies to use and instructions for transferring to another frequency after hailing in order to communicate with fellow boaters, bridge tenders, Coast Guard, etc. I bought mine before heading for the Around The Island Race in Ft. Walton Beach although my model was the one before the current one with the family radio capability. You are not supposed to use the VHF for chatting with your friends on shore, hence the addition of the family channels to the latest model.

There is alot one should know before using a VHF and fines can be imposed for improper or sloppy use. SeaTow has three excellent articles at this site. Print them even if you don't have a radio. The knowledge could come in handy if you hop onto a boat that does have one.
http://www.boatingsafety.com/vhf1.htm