okay since alot of you lately found out that you can use the clock option on the navigations when you don't agree to the navi disclamier, heres another tip.

go to setup,
hit display off,
this will change the map menu to the black space background with the clock.
Yes you can click on the middle to make it bigger or click on the corner to make it sit in the bottom right.
if you want to shut the screen off completely, which I do when I use to get pulled over just hit shutdown,
At the clock screen if you had set a route to a destination using the navi just hit the 2nd button 'map'/guide to bring the map back up.
Going to the clock screen will not reset the route you have entered.

Another tip is when your using the navi, hit guide , then use the toggle on the corner and press up or down to see the next or previous turns