Hi Moggy,
I use a Garmin etrex as the GPS receiver, this sits on my dash inside the windscreen. This in turn is wired to a laptop that has Fugawi software with the IGN digital maps of North Africa from www.daerr.de. I also use Autoroute Express in Europe. I can upload tracks to the laptop, and download waypoints to the GPS. The GPS is powered from the cigarette lighter and the laptop by a 150w inverter. I can also take the GPS with me when I go walkabout.
Only problems that I've had are in heavily forested areas or in towns with little sky view. Excellent way of knowing when you're following the wrong piste over the dunes.
Kevin.
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