I have also been trying to educate myself on new developments with GPS as I had heard that there are now GPS apps that can be downloaded to smartphone which enable the use of just satellite locating in the absence of G4/G3 mobile network and wifi.
I downloaded Backpacker Pro which supposedly has this capability and cut/saved a map while in G4 mode. I then turned everything off to simulate being in a remote area without mobile network or wifi and tried bringing up the map and got nothing…no map, no curser, and no lat/long.
I certainly do not rule out operator error but if I am in an actual situation where I really do need my location in reference to a useable topo map I’m thinking I want something reliable that does not necessitate my knowing how to finagle a tedious routine on a cumbersome app. So I am sticking with my archaic etrex legend to tell me my lat/long and Delorme USA maps on my laptop, with paper maps as backup.