I've always had stand-alone GPS systems. I thought about the built in unit from Toyota, but you just can't justify the cost. Recently I saw a cell phone based system called Telenav. I thought I would check it out on my wife's phone we have through Sprint. For the cost of $9.99 each month that you use it I was sold. It never needs a map update, which cost over $200 for the Toyota system, becuase they are not built in. I was using it on the slower data network on Sprint and it kept up with turn by turn directions with no problem. It re-routes automatically. Has a business finder. But the biggest benefit is it is always with you. My wife can use it in any car she is riding in , hers, mine, or a friends. It does not have the bling factor of the nice big color map in your car, but when you can use it in a friends car when your trying to find someplace it's a God send.

I have TomTom on my Treo, but there again I have to have the bluetooth GPS with my in order to use it. I also have a Megellan Meridian stand alone unit.

Built in system = expensive to purchase and maintain.
Stand-alone unit = moderate price, where to mount, hard to take with you.
Phone based = pay as you go, mobile, small screen.

Prius 06 Black Pack#2