The accuracy of handhelp GPS units is not high enough to do any sort of real property determinations. I work at a land surveying company and know very the difference between "survey-grade gps" and "consumer-grade gps". Entry-level survey-grade gps units run in the neighborhood of $5,000 for a couple units (you need AT-LEAST two of these). Mind you, this can take anywhere from 20 minutes to a couple of hours to collect gps data and must be post-processed on a PC. Even after that, supplemental measurements are required to make boundary/corner determinations.
Some surveyors use consumer-grade gps units to SEARCH FOR (read: SEARCH FOR, not SET) corners that have already been set using standard surveying practices because these units will get them within about 20 feet, which is usually good enough for looking with a magnetic locator (Schonstedt or similar).
If all you are looking for is the BEARING for on of your property sidelines this information can be found on the Tract Map or original survey from when the land was subdivided which will be filed at the county surveyor's office (the county the property is in). It will have angles and distances as well. If you are in a township/range research will be only very slightly different. Legal descriptions take a certain amount of "elegance" and can be difficult to decode without some experience.
Hope that helps or at least raises some questions...
Regards,
DBC