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I already had an external GPS, a Magellan Meridian Gold, so I got the Dell serial cable and use it with a null modem connector and the serial cable for the Meridian. Works well. I can put the GPS where I want to and then put the Ax where I can see/use it in the car. I use Mapopolis Navigator for mapping. They have a good upgrade and update policy and the mapping software is blindingly fast compared to others. PMN is still pretty buggy and slow, Delorme Xmap maps are way out of date for my area and PocketStreets doesn't do routing on the PPC at all.
The Holux got good reviews at gpspassion.com, and it is a good price, so if I didn't already have the Magellan I might have gone that way. It's really a matter of what you think you want to do with it. If you want to go trekking in the woods in all sorts of weather, you might want to think seriously about the dangers of exposing your Ax to the potential for water/insects/breakage. In that case you might want a ruggedized outdoors GPS unit and the cables, like the Magellan or Garmins have.
If all you want to do is use it for driving, then an internal CF unit will do just fine and not have all the cables in your car.
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Want to know about GPS? See GPS 101. Want to know more? See GPS 201.
We must pay more careful attention, therefore, to what we have heard, so that we do not drift away. Hebrews 2:1 (NIV)
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