[Az-Geocaching] Need a recommendation for = in car = GPS Navigation system

[ShadowAce]

 Hay folks..

 A co workers is asking for advice on in an car navigation system.
They do not play our game and have very little if any need of ever
taking it out of the car..

 So I wondered if any of you might have some advice as it is a type of
GPS system I have not really even looked into.

Thanks in advance.