If you take your own GPS to use with rental cars, here are 2 tips:
1. Program in all possible addresses as destinations before you leave home. That includes the airport, the rental car return location, your hotel, meetings, restaurants, etc. So much easier than fumbling with papers every time you get in the car (as I have been doing).
2. Bring directions to everywhere anyway. Never know when satellite might not pick up quickly.
Any other tips?