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Cold start is a dificult thing for any GPS, but it sounds like they're not using a newer GPS chipset.

Oh yes, they are. They're using a SiRF Star III chipset, which is the most recent and most powerful you can find for these sorts of devices at the moment. Time to first fix always takes a bit longer than a regular fix. On the 910 this also takes a bit longer because of some issue which I cannot really comment on, but suffice it to say that TT is working on that and it should be fixed with an upcoming firmware upgrade.
Getting a fix is also highly influenced by the fact that the device is in motion or not. Always try and get a fix before setting the car in motion if you can.
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup