https://www.fixya.com/support/t1918747-map_update_evesham_nav_cam_6200
Alternatively you could just download and use Navmii on your phone. The maps are stored in your phone so it doesn't use any mobile data: just update whilst at home on WiFi
It also has a handy walking mode and knows about footpaths as well, so handy for walking.
Rkttkmtj, March 2022
