I have done the same experience as jbensman. I am working with a lot of different GPS and GIS Tools. But I was not able to generate a stable Custom Maps for my Garmin GPSmap 62.
At the end, like jbensman, I deinstalled OKMap. So I am still looking for a tool to generate Custom Maps for Garmin GPS devices.
garmin_Maps
At the end, like jbensman, I deinstalled OKMap. So I am still looking for a tool to generate Custom Maps for Garmin GPS devices.
garmin_Maps