This web page is from the US Department of Commerce. Which over sees the National Oceanic and Atmospheric Administration, and also the National Geodetic Survey.
One of the nice features of this site is the benchmarking index site. Which lists all 50 states. And does a nice job of showing where benchmarks are in your area. It also has a very nice FAQ page.
NGS datasheets for counties. This is the page you will need if you wish to download all the benchmarks for any particular county. THis is a ZIP file and will require the next link to open it to put it into GSAK.
The BMGPX program needed to take the NGS download and covert it to GPX file for GSAK.
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