AnswerID: 197799 Submitted: Wednesday, Oct 04, 2006 at 14:57
festy
replied:
The solar GPSrs on ebay use the SiRF III chipset, which means they are effectively the same as a BT-338 inside.
There are two main chipsets on the market in 'cheap' bluetooth GPSrs at the moment, the SiRF III and the Nemerix. The Nemerix is more sensitive, but the SiRF III has a very powerful correlation engine which gives it the edge over the Nemerix chipset.
The only drawback is that it uses 3x the power of the Nemerix - so if you were looking at a solar powered GPSr, it would make sense to have a Nemerix chipset. In reality, you'd be doing very well to notice a difference between the two chipsets - both will perform very well under leaf canopies and in urban canyons.
The other advantage of the Nemerix chipsets is it has a 'sleep' mode, where 10 minutes without activity and the GPSr will go to sleep, and wake up when you reconnect to it. This is something that the SiRF III can't do - it can go to sleep, but must be manually woken up with a button push. This may or may not be an issue for you, but it's a nice feaure and one less thing to turn on when you get in your vehicle.
The solar GPSrs on ebay don't source much power from the solar panel - the specs say 12 hrs on battery, 15 on battery with solar suppliment. You'd be better off getting a BT-074S (SiRF III) or BT-77 (Nemerix), I think the solar panel is more of a gimmick than anything else, and add to the unit's size.
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