I did Lady Heather's 48-hour precision survey on an NVS-08 receiver and collected RINEX data at the same time. The NVS was tracking GPS and SBAS satellites. The RINEX result had lat/lon/alt error estimates of .175/.153/.396 meters. The difference between Heather's precision survey results and the RINEX position were: lat/lon/alt: -.638m/1.190m/1.526m