[quickthrower2]

This is probably like when you swim out at the beach, and back and find you are 20m away from where you started due to currents. But you didn’t feel it.

With dead reckoning you could probably figure out.

[lxgr]

You can’t feel linear/unaccelerated motion, and biological organisms aren’t great at indirectly deriving it from acceleration and rotation over time the way inertial navigation systems do.

[stouset]

Hell, even those have a hard time doing it without experiencing drift! So they periodically re-establish a baseline using something like GPS.