Keep shuffling the driver and seats of everyone so that no one falls into a true comfort zone and becomes lazy.
— Goranka Medhi
Have Map Back-Ups That Don't Rely on the Internet
Install several navigation apps that support offline maps and pre-download maps for the region you will travel.
I had two Android devices each with HERE Maps, Maps.me, and MapFactor Navigator, plus maps of Iceland for each app. Some of them turned out to be better at navigation, some other made finding next gas station easier.
Of course, always have a detailed paper map of the area as a backup.
— Marcin Rokosz
GPS > Smartphone
Navigation screens beat phones once you leave the city. My car knows where I am at any point and while it may not have Google's updates, I'll take the road direction over no direction. Garmin or a map, always... don't assume you'll get a signal when you leave the main roads.
— Ted Sindzinski