C120w My experience is limited to the internal GPS chart plotter, the DSM300 sounder, a video cam, and engine data interface with twin Yamaha outboards. My take after one fishing season: the GPS is flawless and I wouldn't bother with an external antenna, since I carry a 3G iPhone with GPS and Navionics Marine chart software for a backup. The video camera (I just hooked up my battery powered camcorder) function is pretty trick, but I have yet to find a "can't live without" use for it. Mostly, I've mounted it up on the tower to watch my trolling pattern. The engine data through NMEA2000 is absolutely outstanding, with a variety of data options to display. I like the hourly fuel consumption, cooling water pressure, oil pressure, and alternator output readings. The sounder module is outstanding when it doesn't "freeze" or otherwise act up. It is definitely defective and will be returned with hopes that its function can be improved. There are many others who have reported this problem with the DSM300. I'll stick with the system despite the few "bugs" and add radar soon. |