Consumer GPS signals are varied randomly on purpose so that idiot can’t fly a missle someplace using it.. so the elevation is typically more off.
If you want you “track” on a GPS and zoom in you can see it moving over time as you stand still.
If the GPS has an accelerator sensor I can tell if it’s not moving and it will start to average out where you are at, and a lot of them do that anyway… so it gets more accurate over time.
Differential GPS listens to a GPS at a known location that sends the current GPS’s signals “skewed” direction and distance from the know distance so other mobile GPS’s can auto correct their location.
Last edited by Spotshooter; 07/02/21.
