The worst GPS on the market
I have a 550 and have had nothing but problems. Sent back to Navman after 6 mos. of very light use because the touch screen stopped working. They took 6 weeks to fix it. Now trying to buy updated maps for US and told Navman does not support map updates for this product anymore. What a joke.

you get what you pay for
Don't waste your money. I already own an icn510 which is great. I purchased this item for the other car expecting it to be newer and better. What I got was a unit that frequently froze up requiring me to pull over and reboot the system, (especially time consuming on the highway). Also it fails to indicate the name of the next street approx 30% of the time leaving you completely baffled if there are more than 1 street within 300 feet, which is not uncommon. Finally the only accent loud enough to hear are the British ones which use british terms such as motor way etc, can be annoying if you are use to words like highway etc. All in all a very frustrating device. Leave it to Navman to make a second generation device that is inferior to the first. Congrats, you can keep this POS.