Reading OOW Alertness Like an ECDIS Drift Alarm

When the bulk carrier Muros grounded off Haisborough Sand in 2016, its ECDIS anti-grounding alarms had been bypassed and its sole OOW had 100 minutes of solo watch ahead of him. The drift alarm that mattered was not the one on the chart display. This post maps how to read OOW alertness with the rigour bridges already apply to ECDIS.

At 02:40 on 3 December 2016, the 2,998 GT bulk carrier Muros grounded on the Haisborough Sand off the Norfolk coast. The MAIB investigation found the ECDIS had an offset chart datum, the anti-grounding alarms had been effectively bypassed, and the OOW had been alone on the bridge for the preceding 100 minutes with no lookout posted. gCaptain's coverage of the MAIB report noted the ECDIS safeguards were "overlooked, disabled or ignored" — a phrasing that matched the alarm-fatigue pattern across dozens of similar cases. The OOW was a European deck officer on a North Sea short-sea trade, a rotation pattern where the 00:00-04:00 watch falls on an officer whose recent sleep windows have been chopped by pilotage and port calls every 36 hours.