l looking for Navigator but di not know what is best.

go to carmax.com
they were very helpful when l bought my navigator
huge selection of car

All GPS systems run on the same basic system, the only difference really between them, that changes the price greatly, is the ''bells & whistles'' they come with. Start with a price range, stick with that, then look at screen size. You dont need to tack on another $100 to the cost 'cause it has an mp3 player, etc. Get a colored screen-they are easily seen, and some good bands are TomTom, & Garmin. l would not stray from those two brands.

just pick your color and your options

Stop by your local Lincoln Mercury dealer and they can tell you all about it. Or lincoln.com

Are you looking for new or used?? either way l would suggest the Ford Expedition, it is the same vehicle as the Navigator it will cost thousands less, be cheaper to fix, and wont have all the useless electronic garbage that the Navigator has that is very expensive to fix.