Spent 6 days Elk hunting in the Colorado Backcountry and onX outperformed my Garmin GPS, hands-down.
I lost my pistol the first day because the holster came loose from my pack while making adjustments. We were using onX on iPhone and tracking our steps that we used to help me find it.
onX was the key in our pre hunt scouting and using the off-line maps while in the backcountry. Never let us down. Only problem I had was trying to use the onX Garmin Map Chip. The problem was with Garmin, NOT the onX Chip. This is a MUST for Hunters and Hikers. Battery usage on phone was very minimal!!
I give onX an A+.