I have one that came with my boat 3 years ago. It works flawlessly, doesn't have much power, has a poor resolution screen, but again it works flawlessly. All I use mine for is bottom depth and for finding structure/holes etc. I think that a higher powered model is necessary if you want to find the thermocline, small baitfish, etc.
I just power mine on, and then up arrow to "backlight" so I can see it in the dark. What exactly are you trying to get it to do? I have run through all of the functions, and used them all(except speed/temp) since I don't have that sensor. Will do my best to help.
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