Any radio will work very well on water because there are normally no obstructions. It would technically be illegal to use your marine radio any other place than on a body of water. It would probably work as good as any similar handheld with the same power output though. It would be nice because most likely you wouldn't have to worry about any competing traffic as I doubt any else is using marine radios in the mountains. I like my UV-5X because it comes programed for GMRS and is compatible with all the other bubble pack FRS radios. Its also cheap, like $30. I think all new UV-5Rs sold now have the GMRS channels locked so you cant transmit on them. The main thing that limits a radio is the antenna. With FRS ones you can't change the antenna. With GMRS radios you can put a better antenna on it to help increase range and clarity.