Never thought: useful Compass app
I'm not a big fan of GPS maps and don't use online navigation a lot. Especially I don't trust blindly on that.
I'm old fashioned. When I arrive in a new city (like Hamburg some days ago) I go into a tourist information and get a city map on paper.
What I never expected was that the Compass app could indeed be useful for some purpose. I pulled my Z30 out of the pocket indeed four times in only two days to get the north direction. "Where is north?" is sometimes a reasonable question in an unknown city where you use subterranean traffic systems a lot. When you then get up to the air again you have tall buildings around hiding the sun and you walk into a wrong direction ... The magnetic Compass, a tool from the analogue age, is what the 21st century common man needs :)
BTW: I had several outages with that. Sometimes the magnetic compass is blocked in it's position until you cause a GPS request. After this request the needle works again, also without GPS.