Hello, building up an expedition vehicle and have already installed a CB radio. I purchased a small, handheld VHF radio to get some experience first (before an expensive purchase). I know nothing of this type of radio. My goal isn't so much talking to other campers, but an emergency radio if I run into trouble in the outback. Is there a difference between marine VHF and something you would use on land? I bought a "Hummingbird" handheld VHF radio to play with. The book only lists marine frequencies. Did I screw up? Thanks in advance. Jason