Use this article if…
- Built-in maps show wrong position, slow lock, or “searching for GPS”, not only when the app has no internet.
- Maps stall with no data at all → Internet on MK4. CarPlay maps wrong with good phone GPS → usually phone/app, start with Phone pairing.
Quick answer
Weak or wrong GPS on the MK4 is usually location mode set to low accuracy, missing permissions for maps or Play services, wrong automatic time, or the vehicle blocking sky - turn on high-accuracy location, fix the clock, grant permissions, then verify with a short drive in the open.
Problem
- On-board navigation or Android location on the MK4 is unreliable: offset, drifting, or very slow first fix.
Symptoms
- Arrow lags hundreds of metres in the bush or on highway.
- “GPS” icon grey or flickering for many minutes with clear sky view.
- Position jumps when you exit a shed or dense canopy.
- Time zone or map recents look wrong after battery work.
Cause
- Location permission or high-accuracy mode disabled for navigation / Google Play services.
- No AGNSS/cellular or Wi‑Fi assist - first lock after long storage is legitimately slower.
- Vehicle structure: steel bull bar, roof rack, or canopy shielding the internal antenna at certain headings.
- Automatic date/time off - some map stacks misbehave until the clock is correct.
- Power-saving or battery-optimiser policies throttling location when the screen is dim.
Fix Step-by-step
- Open Android location settings: enable On, set mode to High accuracy (GNSS + Wi‑Fi + if available mobile).
- Confirm date/time set to automatic with correct time zone; key cycle after DST or battery removal.
- Grant location to your nav app and to Google Play services; revoke “approximate only” if offered.
- Test with a short drive - first ute tray open vs canopy closed - to see if metal cover is the variable.
- Download or update offline map regions so routing still works when data drops.
- Disable aggressive battery optimisation for maps and location services for one trip.
Notes
- Data path: Internet / SIM / hotspot
- When using phone projection: many apps use the phone’s GNSS - fix phone location permissions there.
- Wireless projection stability: Wireless CP/AA