I have a Garmin 64s handheld GPS unit. I'm not sure why, but I'm finding it difficult to comprehend. I have no issues using it when mapping or dropping waypoints, and such. However, Base Camp has me a little befuddled. I have duplicate waypoints on my GPS, as though both the unit AND Base Camp are saving them. I've downloaded topo maps but they disappear when I zoom in too far. I'd rather just use OnX Maps. I have a subscription to that, but I'd rather use my GPS unit for OnX than my phone because it sucks my phone battery down so fast. Is it possible for me to do that? Any help would be appreciated.