Add a navigation PAUSE button. On a trip, if I decide to stop at a fast food place, using a pause would stop provide directions, without canceling the trip.
Once un-paused, the navigation would resume with corrections to continue the trip from the un-paused location.
In this example, it would keep navigation from telling you directions while you are trying to order in the drive thru line.
Moderator: Alternative today is to select Cancel. To resume, select Navigation and pick the last destination from the history list.
(lightly edited by moderator)