Overall this is a great app for planning and tracking a hike. The ability to view location and tracks offline without a cell signal is fantastic and helped me a great deal during a 2 week backpacking trip to Philmont Scout Ranch in New Mexico, where the boys are responsible for navigating, but having a 3d map of the routes as a backup was so valuable. It helps me during a hike to check the terrain to see how much more uphill or downhill I've got to do before giving the knees a break.
A couple of usability improvements would be greatly appreciated. 1) When downloading a map, it would be nice to have the default map area be the area currently being displayed, not the current location. The use case is this: I've downloaded a route or waypoint list and now want to download a map of the area. I choose "Add New Map", and the default region is my current location, and I have to pan and scroll over to where I hope the waypoints are. So annoying. 2) The process to import a .gpx file is cumbersome and not intuitive. Save to Dropbox, then Open the Maps 3D app, then go to Track List, then Import Tracks, then choose Open Dropbox, then Select the File, then Export > Open In ... and finally Maps 3D. It's a convoluted exercise that I wish was easier.