An interesting thread. I note that no one has mentioned the grounding of ROYAL MAJESTY off of Nantucket in June of 1995.
Ref: https://towmasters.files.wordpress.com/2009/03/ntsb_royalmajesty_grounding.pdf
“The National Transportation Safety Board determines that the probable cause of the grounding of the Royal Majesty was the watch officers’ overreliance on the automated features of the integrated bridge system…”
“After the accident, representatives from Majesty Cruise Line and the Coast Guard examined the Royal Majesty’s GPS antenna and receiver. They found that the GPS antenna cable had separated from the factory connection at the antenna. The antenna cable, which was factory assembled, showed no sign of physical damage, other than having been separated from the connection.”
Another source mentions that on the previous passage –
"Satisfied with the accuracy of the fix he just laid on the map, the navigator walked away and joined the captain, who was standing by the large windows. Above them, on the flying bridge, the loose GPS cable was banging freely in the wind and slapping the flying bridge’s deck; the connection between the GPS cable and the antenna was coming apart. At 2:52 P.M., interruptions in the global positioning data began: after a few seconds of no position signal, a one second alarm chirp sounded, similar to a wristwatch alarm. Nobody heard it; it was barely audible. At 1 P.M., the captain commanded ‘‘change course to 336, take us up to Boston.’’ Nine minutes later, the global positioning system signal was back again. But it did not last long, because at 1:10 P.M., the connection between the cable and the antenna broke away for good. "