Hi I use normally a EGNOS/WAAS submeter DGPS, often for OSM mapping. :-) My DGPS run really well only in optimal conditions (no satellite obstruction, multipath, etc.), but I observed that the performance in a urban environment is normally lower than a "normal" bluetooth GPS based on a Sirf III or a MTK chipset. I think that one of the keys of these cheaper GPSs are the better sensitivity than the most expensive DGPS, as well as the algorithm for calculating the position (myDGPS uses also carrier for decoding the signal).
Bye Alberto
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