IMHO it's pretty useless to use Google Earth with your GPS, the only thing this would do is to show your current postion in the application - Javier, it does not show realtime pictures - and that is useless because you would need a broadband connection to the internet while on the road.
As Javier already mentioned, the cache size is limited to 512MB and there is no option to cache certain areas of the world for your journey. I do not think this will be fixed, pretty shure that is an intention, at the end Google is only a commercial company having the intersset to bind their customers.
Another very simillar software is NASA Worldwind ( http://worldwind.arc.nasa.gov), it's in a very early stage but has simillar capatibilities as Google Earth, it offers the capatibility to have you data localy stored and, most important, it is opensource. I'm shure there will be loads of activity in the opensource community in the near future. For now, Google Earth is the better sollution because it has better quality pictures (Landsat 7 in best quality and the hires pics) and has a few killer features Worldwind does not offer - yet...
Even so, still a brilliant piece of software!
Cheers, Kudi
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