Veteran-owned, BBB A+-rated, and founded in 1956, Custom Marine Electronics in Point Loma holds B&G Certified dealer status and Factory Authorized Installation & Service credentials from its Shelter Island base at 2525 Shelter Island Drive. Factory-trained technicians install and service Garmin fishfinders, Furuno radar arrays, Raymarine plotters, and Simrad autopilot systems, handling everything from single-transducer mounts to full helm rewires — a multi-brand depth comparable to the integration work at Seanet Electronics Inc two blocks away. Repair services keep aging systems operational through software updates, transducer swaps, and antenna troubleshooting, extending the life of installed hardware without requiring full-system replacement. Nearly seven decades on Shelter Island have built referral pipelines with the yacht clubs, charter fleets, and commercial fishing operations that dock along the drive, a marine-industry tenure reinforced by the chandlery inventory at West Marine. Complete bridge-electronics packages — radar, GPS, autopilot, VHF, AIS, and fishfinder installed, wired, and commissioned as a single integrated system — represent the shop's most involved project.