Chuck,
I haven't used mine in flight too much, but this prompted me to learn a little more about it and actually use it as the tool it is, the clock items in the lower left will show a time laps of radar, IR SAT and VIS SAT, (satellite), on the flight plan route I do see you can clear the route with the menu button top right, I do not have a plus/minus in the lower left.
I just down loaded an actual manual and going to read up