<a href="https://en.wikipedia.org/wiki/Selective_availability_anti-spoofing_module" rel="nofollow">https://en.wikipedia.org/wiki/Selective_availability_anti-sp...</a><p>> allows satellite authentication,<p>and<p>> May 1, 2000 it was announced that SA was being discontinued, along with a United States Presidential Directive that no future GPS programs will include it.<p>How viable is Starlink as location service, now?