Hidden Screens

FWIW, I just discovered that if you go to View Map, then tap on Speed in the lower left-hand corner, then press and hold on the big mph icon for seven seconds, you will get a series of menus with lots of info. Just keep pressing Next at the bottom of your screen.

If you press and hold on the battery symbol or, on some models, on the time display, this too will lead to hidden sub menus.