GPS is one of the easiest ways to locate to a close proximity to most locations including claim corners and boundaries. It is important to realize that un-patented mining claims are by regulation not required to be surveyed and that location notice map and other locating instrumentation supplied is only required to be used to find the location of the actual site and not be relied on as the final boundaries. This information is to get a reasonable person close enough to know where the claim is by physical pins, stakes, cairns, signage markers and so on.
GPAA has endeavored to locate GPS coordinates in combination with maps in the guide that are the most up to date system for the purposes of finding claims accurately. Each claim when it is put on a GPAA map has attention paid to its location by use of an official location notice and usually map that is current and on file with the claim record keeping agency. Most claims this is the Bureau of Land Management.