I have an I-com also. Its great, recharges on the 120v via the
inverter. It was recommended to me that I get one, for the ICW trip I was taking, and it proved to be the most valuable piece of equipment aside from the depth guage. Most
VHF communications seem to be within a quarter mile or so and these portables do fine. Bridges, boats, dredge bargers, etc, all communicate so everyone knows which way to go, stop or wait. Marinas also guide you into their slips with a portable. In some cases its the only way to figure out what one is to do. Buy it, you will never regret the money spent!
Paul