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Well the sirf III is good and probably helps the aquistion and signal strength limitations due to positioning, but gps units still work better with a clear shot at the sky. Dangling from the ignition is a crap shoot depending on the vehicle. My favorites are the slightly larger ones that have the photo cells to help keep the battery charged. I have never run out of juice using mine. It also has 8 mb data logging onboard, for about 65 bucks. I do wish it were sirfIII, but you can't have everything. I would say about this unit,,,looks cute, but there are as good or better units for far less cost.
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So what does that switch do?????
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