We use GPS fairly regularly in the Centre for GIS at Kingston so tend to keep an eye on developments in kit, particularly those that are useful for human geography/geoscience. We currently use (in conjunction with PDAs running ESRI’s Arcpad) some Fortuna Slim bluetooth GPSs which are cheap and sufficient for many purposes.
Recent announcements up the ante for low-cost, accurate, GPS. In particular the fully integrated Trimble GeoXH which claims a <30cm post-processed accuracy. For a little bit more money you can acquire the Thales Promark 3 which boasts <1m real-time accuracy and <1cm post-processed.
