The AVIS GPS system is utter junk.
It does not have the logic needed to work out routes on its own. It is a Nextel phone, which you attach to the windscreen. You have to call AVIS, wait on hold forever, and then tell a person your destination. They will program a route, send it to the phone, and the phone will then read out the directions. It's so bad and such a waste of time I couldn't believe it.