I personally just look up directions online before I leave and take a few notes. Usually commits it to memory.

Regularly relying on a GPS in general provably makes your brain weaker:

https://newatlas.com/gps-spatial-direction-ucl/48529/

You can buy standalone GPS systems or use the one built into your car. Maps also exist

It’s easy to save map regions that work offline. GPS is passive and doesn’t need an internet connection to function.

Yes, it's worth noting that your GPS is still active even in airplane mode.