I’m thinking about buying an affordable GPS unit. Not as a techno toy but an educational tool. I am looking for something that will work well for exchanging (up/downloading) with GIS. Downloading GPS is obvious. But something will allow easy uploading of GIS data, e.g. shapefiles or raster data. The DeLorme Earthmate PN-40 Handheld looks pretty cool. Sounds like it will allow me to upload all kinds of data and even selectively display this data as layers. But the last thing I want is to be limited by another piece of software from Delorme for all this data exchange. Need to see if that is necessary.