Rather than buying a bluetooth and then paying $10 a month for a marginal app(most of them are marginal imo)I would just cough up the $200 for a garmin and have a nav system I know will work.
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I use a Freedom 2000 keychain puck and I have been very satisfied with it. The battery lasts me probably 4-6 hours of continuous use. I have used it with Navigation apps like Nav4all and AmazeGPS, and geocaching with BlackStar, Google Maps and BB Maps.
It is very accurate. Fairly inexpensive.
I have not tried any other pucks so I cannot say how it compares.
There are only a few different GPS chipsets out there to be shared among all the hundreds of GPS pucks.
You'll find GPS with 51 channels, 66 channels, etc. Folks will say "so what there's only 3 or 4 visible satellites at a time". But I'm pretty sure each satellite broadcasts on different channels for position, almanac, etc. So more channels is best.
I've got a GlobalTop G66 that works great except for the 2-3hr battery life. For the life of me I can't remember which chipset it uses, maybe MTK? It'll receive on something like 51 channels. Cost me $50 bucks online.
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