>Fifty-two minutes after leaving St. George’s, Bermuda, on its way to Boston, the Royal Majesty’s GPS antenna cable became detached from the GPS antenna. This p

>Fifty-two minutes after leaving St. George’s, Bermuda, on its way to Boston, the Royal Majesty’s GPS antenna cable became detached from the GPS antenna. This placed the GPS in dead-reckoning mode, which does not take into consideration wind or sea changes. The degraded GPS continued to feed the ship’s autopilot. No one noticed the change in GPS status, even though the GPS position was supposed to be checked hourly against the Loran-C radio navigation system, which is accurate by roughly one-half to 1 nautical mile at sea, and a quarter-mile as a ship approaches shore. Is there some reason why the GPS device couldn't raise an alarm when it dropped into dead reckoning mode?