How do you hard reset a 2003 Ford expedition navigation system?

To hard reset the navigation system in a 2003 Ford Expedition, start by turning the vehicle's ignition to the "On" position without starting the engine. Then, press and hold the "Power" button on the navigation unit for about 10-15 seconds until the screen goes blank and the system reboots. If this doesn't resolve the issue, you may also disconnect the vehicle's battery for a few minutes to reset the entire system. Always ensure you have any necessary navigation data backed up before performing a reset.