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I have the Haicom Multi-Mode GPS Receiver HI-303III CF GPS receiver. The SiRF III receiver works really well. I can even get a GPS lock inside my house, next to the window. You can pick one up for <$80.00 or $70.00 for a comparable SiRF III model.
I also have a GlobalSat BT-308 bluetooth GPS, but I don't use this much. I have bunch of different accessories paired with my X51V, so I rather free up the BT bandwidth.
With a CF GPS, you won't need to worry about carrying another charger with you.
I have the iGuidance and it works great. It's fast to calculate and re-calculate. I used TomTom (old version) before on a Toshiba Pocket PC and it was really slow.
I'm using iGuidance in real VGA mode and the letters are a little small, but the display is awesome. Only problem is the 3D mode does not work in this mode. The 2D mode work fine.
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