I have yet to use the phone for maps other than to just look at a map if I am out and about and need to look up something. Maybe, I should give it a try.
Basically, I presently prefer a separate Garmin GPS because of the way I program routs on a trip. That is, I go to computer for larger look at GOOGLE Maps and set a route (detailed points sometimes, especially for my back road MC Rides) and then transfer POINTS that I set on GOOGLE Map to Points on the GARMIN GPS.
I number those points as 1, 2, 3, etc. and navigate from point to point. Mainly, I find that gives me better ability to set the exact roads I want to take VS setting a distant point destination and letting the GPS choose the route.
My method works GREAT for MC rides on back roads (like some pig paths I ride exploring the country side on MC) to allow me to force the GPS onto a certain road sequence.
Hard to teach and Old Dog (me) New Tricks. GROAN Maybe, I need to try some other methods.
Wonder, does your app allow such procedure as I explained?