Summary: bought in april had it in the box in a cupboard installed in december. worked well for 2 weeks. boat went on hard for 2 months boat back in the water it worked for about 1 hour then amp protect fault shows. amps disconnected same connected to battery alone, same fault. tech says internal fault.
Summary: I did a lot of comparison shopping before I decided on the head unit for my boat. It came down to the Clarion M309 or the same level Alpine head unit. Both had all the features that I wanted including XM ready and wired remotes for controlling the head unit from different parts of the boat.
Summary: Technically this radio works as advertised. However, the sound quality is rather poor at any reasonable volume level for a boat environment being outside with wind. Also very little audio adjustability. Just Bass, Treble, Balance, and Fader. Again, a very CHEAP radio to carry to Clarion Name.
Summary: I purchased this unit for use in my boat. I installed it myself, which took some wires, splicers, and a little bit of electrical know-how. The sound quality of the unit is great. No complaints. My one complaint is that the user interface is ridiculously difficult to learn.