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Your right about battery, I had to buy a USB port for my bike for just in case. But is is my phone/mp3/navigation/internet/PDA/game console. So I don't expect it to last more than a day.
location is pretty good. It can tell the difference between my front porch, back porch and which way I am facing. I get an average of 3-5 satellites more out of the city.
I am not sure if you know this but if you save the maps you don't need data. Not sure how much you can save at a time but I have 1/4 of pa saved from when I was using it for geo-catching. I never looked into it but with 65g of storage I'm sure I could fit the us maps.
It just seems redundant to carry 2 things that do the same thing. I will admit that the HUD GPS it pretty cool though.
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