Its important for boaters to realize that Best Buy is really upping the game here. I have personally been involved with training of selected members of the Geek Squad (owned now by Best Buy) in the nuances associated with marine electrical systems and electronics. Its not just me either. Besides requiring that their techs be certified in marine electrical by the ABYC, Best Buy is also requiring that the techs achieve NMEA (National Marine Electronics Association) certifications as well as proprietary training from the equipment manufacturers. This, mind you is on top of Best Buy's internal basic electronic technician certification. In short folks, these folks are highly trained individuals. I would add, they take what they do very, very seriously.