I do realize that this thread is old, but I figured you'd be interested in a diary entry I wrote<http://www.openstreetmap.org/user/Guttorm%20Flatab%C3%B8/diary/17490>on the subject of using external bluetooth GPS with Android phone.
On a sidenote OSMTracker for Android<https://play.google.com/store/apps/details?id=me.guillaumin.android.osmtracker&feature=search_result#?t=W251bGwsMSwxLDEsIm1lLmd1aWxsYXVtaW4uYW5kcm9pZC5vc210cmFja2VyIl0.> can now upload tracks directly to OpenStreetMap, and Vespucci<https://play.google.com/store/apps/details?id=de.blau.android&feature=search_result#?t=W251bGwsMSwxLDEsImRlLmJsYXUuYW5kcm9pZCJd> is days from releasing a greatly enhanced version<https://groups.google.com/forum/?hl=en&fromgroups=#!topic/osmeditor4android/TCM9ht_2lCI> . On Tue, Jul 10, 2012 at 1:47 PM, Boris Cornet <[email protected]> wrote: > Cell phones use cheap chips and small antennas, which is not good for > accuracy. And the ability to receive the single (!) compatible Russian > satellite (so far) is merely an advertising gag. > They are still often very good, and much better than old GPS devices. However, as I note in the diary entry it seems they're made to be too optimistic. The Russian satellites I was referring to are in the GLONASS<http://en.wikipedia.org/wiki/GLONASS>system, and they have 24 operational satellites. The combination of GPS and GLONASS supposedly improves general accuracy and position stability because of ability to receive signals from more satellites at a time, and GLONASS alone is supposed to provide better accuracy at northern latitudes. A quick search on Google Scholar brought references<http://mycoordinates.org/ppp-using-combined-gps-glonass-measurements/>to support this. -- Guttorm
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