Hi Lawrence
I'm not certain if the Leadtek unit would do what you describe, but I don't have any experience with it. Caveats of that particular unit are accuracy (10m, which is a big distance on a farm scale), and the output format. GPS Trackmaker can read a lot of formats, and the Leadtek supports NMEA 0183 (a standard GPS format) which TM can read, but in my experience you'll be scratching your head some making that work.
The Cybertracker link posted looks interesting...I'll be digging some into
that one myself
Here's a scenario.....
Take the GPS to your site, and map the elements of interest...property corners, trees of note, tillage boundaries, ponds. On non-point elements (polygons or lines), walk the perimeter, taking points along the way, or engage a tracking function, if available (Garmin, and others have this)
Take the GPS to your computer and plug it in (or Bluetooth it), and open the GPSTrackmaker software. Download all of your points and tracks, and save them as a shapefile (a GIS standard file).
Open the GIS software, and add some new elements into a shapefile (new plantings, ponds, access roads). Then open that file again in Trackmaker, and upload it into the GPS. Walk the property with those points, and you will be able to pinpoint all of your features on the site.
That's a real quick and dirty rundown. Let me know if it helps
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