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.
Please don’t listen to this guy- he’s spewing information that hasn’t been correct in over 20 years.
OP: it’s your receiver.
