Does anyone have recommendations for a good USB GPS dongle that return NMEA strings? I've tried numerous GlobalSat units; they're cheap and lousy, rarely holding lock, and just sitting in one place return changing coordinates and garbage NMEA strings. Plus, they update only once/second. The only alternatives I've been able to find are the ones made by/for Microsoft (Pharos, etc), which won't work on OSX, as far as I can tell.
Where were you testing? GPS can be bad between tall buildings or under trees. It also helps to put the antenna on your car roof. There should be a magnetic base for that.
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