At least today, we have the invaluable smart phone as a tool. Not saying to depend on it solely, but it can get you out of jams.
For those that only had a paper map years ago, that had to suck. I know a lot of guys still say to stick with paper, it's better... in some ways yes. But a live map shows you exactly where you are. Sometimes you can be looking at a paper map but if you have no point of reference other than driving until you find some signs that can be a pain and a time killer.
Outside of the efficiency of using turn by turn here or there, sometimes Google can be your friend. Sometimes you'll find you'll need business info. I've brought up company web sites for such info. Like looking up business hours for a misloaded package.
Tip: just like looking at your diad, only use walk time when using your phone for help. You can have a productive day even when you don't know an area.