CO997

I do not have the NAV system in my car, wish I did, but I got the car off the floor. I've been reading the posts from some of you that have had it installed after they got the car. Everyone seems happy with it which is great. My question is has anyone looked at NAV systems from other manufactures like Garmin. They have many different systems for much less money. If so how do they compare to the Porsche system, which one has more options, easier to use, etc... One nice think about the Garmin is I can take it out of the car, but is it as functional and easy to use as the in car system from Porsche?