I just returned from a backpacking trip and used this app to assist with navigation and trail finding. The ability to download the topo maps for free from within the app is huge!! The GPS function is great and works in airplane mode. We needed 4 maps for this trip and fortunately adjacent maps can be stitched together. Sometimes some of the printing from the margin will still be visible when maps are stitched but that is a relatively minor complaint. Ignore the reviews that complain about the old maps. The reason for using the 1970s maps is the greater detail and more trails, as explained thoroughly in the app details and on the website. The complaints are mostly from people that didnt read the documentation and probably dont know how to use topo maps anyway. This app is highly recommended
Dandroica about Topo Maps, v1.15