Had a quirk with the sonar on my bow mounted 787c2 not wanting to read properly when I first turned it on, worked fine after you run the boat. While on a trip to Lake Eufaula thought I would run by Humminbird to see if anything was wrong. They changed out the unit and also upgraded the software on the unit in the dash of my Sabre FTD. The Tech at Hummingbird went over everything on the units and set them to what he deemed the proper settings. He as well as the receptionist took time to explain what all the settings meant. The upgrade made the units a lot clearer and easy to read. Everyone at Humminbird was eager to please, was asked if I was being helped by everyone who saw me in the lobby. Good job Humminbird. SATISFIED CUSTOMER