I purchased this deck to replace the aging M475 that had done me well for years. Clarion marine head units are known to be some of the most durable out there. I was excited for the Bluetooth capability and updated technology. Upon receiving, installing and using the unit, I knew that I had made a mistake. The technology is great, yes, but the interface is pure junk and has to do with the ridiculously large front control knob. This is the only - ONLY - way to control the deck. It's very sensitive and awkwardly large which makes trying to complete a task as simple as turning the volume up and down while the boat is moving in any kind of chop completely impossible.

One little bump to any side and a random menu comes up and it's mess to get it back to the start just to change volume. Just to get to the bass/treble control you have to hold it down just right in the middle, then scroll through menus, hoping all the while that you don't bump it to one side and lose your place and repeat process. In the two weeks that I've owned it, I've turned countless time to the female co-captain and said, "I HATE THIS DECK". I've decided that I'm returning it, and going with the M309. Oh, did I mention that the unit isn't even SEALED in back like the M309? The circuit board is wide open for water/moisture intrusion. Garbage. Sorry, Clarion. Nice try, but epic fail.