Summary: I have always liked Garmin products and have owned a couple of hand held GPS units. They are solidly made and have lasted for years. So when I saw that they made a fish finder I didn't hesitate in getting one for my new fishing boat. I couldn't be happier. It works very well. I need to learn how to tune it better, but most of the time I am too engaged in fishing, but the auto sensors settings work just fine for me. The screen is easy to see in the light.
Summary: I recieved this Garmin 550c fishfinder and after drilling holes in my boat for the transducer and mounting brackets,and after fishing the wires from the transom to the console plus making the electrical connections, the unit never powered up. I called up Garmin and they determined that the 550c was defective and they wanted a copy of the invoice that was never sent to me or attached to the shipping carton. I called up Amazon and got the invoice e mailed to me.