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I just bought a Standard Horizon GX1700. It's got a really small form factor and built in GPS. Lot's features for $150 or so. I"m in a 13 foot Whaler Super Sport Classic going near shore and bay. Two is one, one is none in my opinion. Having the second radio on your vest is a great idea. Cell phone providers don't usually point their antennas towards the water in my area. I'm more likely to be calling 911 in Mexico than the US. YMMV.