Add a simple 'pause navigation' button.
The idea is to add a pause navigation control, to allow you to do any number of things while keeping the route active. I stop to visit a store on the way, and the phone is nagging me the whole time to go back to the route.
Closing the route an resuming afterwards is not a perfect solution, as I sometimes navigate in areas without good cell service. I can't pick up the route and continue until I find a way back to data.
As a suggestion, have an option to 'Pause' appear when the user is off course. If you're suggesting they go back to the route, allow them to pause until they want the info again. They just might be grabbing a sandwich or looking at scenery.
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Gary Yetter commented
It sounds like common sense to me. Maybe that's the problem.
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Don Proctor commented
I know it;s a duplicate, but I wanted to add a bit of extra context.