Comment by ihatehn

It highly depends on what you're doing (a road trip vs a grocery run vs hiking mountainous back country) but the first step is to do a sanity check of the route. It's very easy for many GPS apps to route people to the center of an airport for example (i.e. the middle of the runway) instead of the main terminal, and only recently have a few apps managed to do better about that. Other times you can just easily spot that it's not a great route by reviewing it for ten seconds.