My "inexpensive" mapping GPS is a Garmin 76CX. I find the accuracy to be reasonable for my needs. You can use the Garmin's software to convert to shp files, or use DNR Garmin Developed by Minnesota Department of Natural Resources. DNR Garmin is hand little free program.
CCA, CPSS, CPSEC
Reared on a farm in Southwestern Illinois
Educated at the University of Illinois in Urbana-Champaign (1977)
25 years with USDA-SCS (NRCS since 1994)
Soil-Right Consulting Services, Inc. 2005 - 2015
RPM Soils LLC 2016 to present