The GMX-550 does exactly what is advertised. My specific reason was the iPod interface and ability for a front camera. I installed the GMX-550 in my 2010 GMC Sierra and had to place it under the center console, forward of the utility tray and not under the radio as advertised. There is absolutely NO room for the wires and unit under the radio. It is very important to remember that when activate the NAV In-Motion option, your GPS does not work for a little over a minute. It appears that the vehicle speed is disabled or ‘zeroed’ in order for the NAV In-Motion to work while tricking the vehicle that it is stopped. I’ve had problems with the GPS catching up after exiting this function.
Adding a front camera allows very close parking and prevents bumper collisions. I installed a High Resolution 170 degree back-up camera from eBay ($18) under the grill.
Add a blue tooth interface to securely unlock doors, window, and other features associated with the vehicle control bus/protocols.
Pros: * VERY easy to connect matching wiring harnesses and plugs.
* Intuitive interface
* Reliable performance
* iPod, iPhone, iPad controls ported to the vehicle’s touch screen
* 6 feet of iPhone, iPad, iEtc, cable to reach front and back seats
* Multiple video management configurations. Dual back
monitors, Front monitor, Video game input, Camera
Con: * Lack of wiring diagram resources available to connect existing
(factory installed) rear camera functions.
* Intermittent problem not restoring GPS functions after NAV In-
Motion. On rare occasions you must manually return to
* Factory “in-motion” warning from top of screen while in video
Bottom-line: I’m very happy with my purchase and the performance of the GMX-550. I am considering installing turn-signal cameras on the side mirrors to compensate for blind spots. I also used the back-up function and installed a mini camera above my trailer hitch and can very quickly land the hitch and ball at any angle with extreme accuracy. I look forward to additional firmware upgrades.
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