I would wager a guess that the paranoid types at the pentagon, CIA, NSA have a way to limit the usage of GPS satellites when they think it is needed.
I was camped at one spot for about 36 hours. I had cellular service , so was able to restart** the phone several times over a period of hours. I'd quit Gaia, then turn Gaia back on, then maybe get my real position for a few seconds, but quickly Gaia would revert to placing me back in that same wrong location. Somehow, Gaia was stuck or fixated on one geographic spot that I had travelled through the previous day. The false location went away when I started driving away from that 36-hour campsite location. Both the iPhone and Gaia have worked normally since.That does sound like app that has stopped or hung up. Did the position resolve on it's own or did you have to re-start your phone?
Love use of “no impact” in discussion about bombs!I will see if I can find it but given it was so long ago I doubt it. The premise was we were at war and we did not want an enemy to use the data against us for their bombs. So they talked about manipulating the GPS coordinates so the bombs would only go to locations of no impact. Our systems would have the data to adjust for this.
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If there is another phone around that is setup as a Wifi Hotspot and the hotspot is turned on (to share the cellular network with a laptop, etc), then the location service inside your phone may see that hotspot and think you are where the Apple/Google WiFi location service learned that the hotspot "is".Most of the time, the Gaia app on my iPhone is accurate enough for my amateur purposes. However, I have occasionally gotten a false location from an iPhone Xr running Gaia. It's unknown to me how much is iPhone/iOS, how much the Gaia app, and how much is the interface between the two. I have never [that I know of] gotten false location with either of the 2 modern Garmin units I've owned, Montana 650T (2011) and the new Montana 700i(2021). Most recently, in March of 2021, it took the Gaia app about 24 hours to finally stop telling me that I was ≈30 miles away from where I knew I was. Very annoying.