Great but unreliable... Updates erase maps – Navmii Offline GPS USA Review

Great app when maps are downloaded... But ... Updates erase the maps!! When a map has an update available that prevents the current version from staying usable. When the app updates all maps are lost and have to be downloaded again! This is terrible for those wanting to keep a large number of maps downloaded on a device for emergency situations. I cannot have automatic updates turned on for my device and keep maps ready to use.
Review by lordmorgul on Navmii Offline GPS USA.