One reason I don't or won't use my Inreach for a GPS is I want the battery to last as long as possible so when a 911 is needed it's there. I can use my Garmin GPS and have spare AA lithium batteries in my packWhy not? Earthmate has landowner, photo's, topo, USGS quad's, digital Atlas, streets and the Hybrid which puts roads, topo lines and water over the top of a photo. What more does a guy need? If you can't navigate with all the map options in Earthmate then no mapping app is going to help.
I'm not sure whats all included with Earthmate now but since I was a paying member a few years ago before they stopped the pay for upgraded maps I still get GMU's, Survey maps and landowner names.
From what I have seen and I have messed with most of the mapping app's for my job Earthmate is just as good as any of them.