ground

It's a phenomenon I've encountered on a number of occasions in my marine industry career. The causes are simple and easily understood, while the solutions can be maddeningly elusive. The side effects can be everything from static or distortion on an otherwise high-quality television screen to humming or buzzing on a VHF radio, and in some cases, malfunctions in autopilot control systems, some of which may be dramatic. I've troubleshot more client complaints that start with the observation, "when I key the microphone the boat makes a hard turn to port/starboard," than I can recall.