Guidance: MGN 357 (M+F) Amendment 1: night-time lookout – photochromic lenses and dark adaptation

In response to the Marine Accident Investigation Branch (MAIB) report into the loss of the sailing yacht OUZO and her crew, this notice gives guidance on:

1.1 As part of their investigation into the loss of the sailing yacht OUZO and her three crew, the MAIB commissioned a report from University College London’s Institute of Ophthalmology on photochromic lenses, as these were worn by the lookout on the Pride of Bilbao at the time of the incident. Photochromic lenses are those which darken with exposure to strong light and lighten in dark surroundings.

1.2 The report demonstrated that the light transmission of these lenses was significantly reduced as compared to ordinary coated and uncoated lenses, which would have decreased the likelihood of the wearer detecting navigation lights.

1.3 The report also asserted that an insufficient period of dark adaptation is likely to have been a significant factor in the lookout’s failure to see the yacht earlier. It also identified significant white light pollution in the wheelhouse and the red filter from the chart table light had been removed, both factors which would have reduced the lookout’s night vision.

1.4 On the basis of these findings, the MAIB recommended that photochromic lenses should not be worn for lookout duties at night. This notice advises operators, masters/skippers and seafarers on precautions to be taken by those with lookout duties at night.

2.1 With respect to taking over the watch, STCW A/VIII Part 3-1, paragraph 19 states:

“The relieving officer shall ensure that the members of the relieving watch are fully capable of performing their duties, particularly as regards their adjustment to night vision. Relieving officers shall not take over the watch until their vision is fully adjusted to the light conditions”.