Key Maps

Key Maps are useful.
Even though streets keep changing, they mostly stay the same.
The great thing about Key Maps is they are not limited to the map you print out online.
Furthermore, they are not like GPS's which are dependent on electricity (which if you do not have, you can not use it.) (Which means it is also EMP proof.)
Key Maps lists all the streets so there is less confusion when it comes to streets that are named the same.