My HDS5 got wet and went crazy! I sent it back to Lowrance and they sent me a new one, no questioned ask. These units are really sensitive to electrical currents. I had mine attached to the trolling motor battery, thinking "one less thing on my cranking battery" and it wouldn't work. It would shut down or blink when the trolling motor came on. I switched it to the cranking battery and it works fine.

Stanley_P