A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
From: David C
Date: 2019 May 5, 21:06 -0700
Thanks for the link Frank, but I'm afraid the author (Sophia Chen) has a poor understanding of how GPS works, she wrote:
This is actually how GPS works. Satellites pinpoint your location on Earth by precisely measuring how long it takes a radio signal to bounce from your phone back to space
I regularly read stories in the media which indicate that the author believes that there is two-way communication between a gps receiver and the satellites.