LateToTheParty
Didn't want to come
If anyone's systems are actually doing that sync I think it must be a phone setting.FYI, don't use a phone plugged into the truck radio/NAV as I think that dives a false GPS reading (still from the truck). Standalone GPS as it sounds like you have, or phone not connected.
During my time of guessing/adjusting, I tested mine using two identical Samsung phones running the same version of Waze with one connected via USB and one not connected (and never activated truck wifi).
Both phones read exactly the same and both were different than the truck