Un recente studio , effettuato a terra con uso di simulatori , su martittimi esperti, ha dimostrato che la suddivisione dei turni di guardia in 6 ore on 6 ore off , comporta un maggior rischio che l’operatore si addormenti e che comunque riesca a dormire meno durante il periodo di riposo di chi fa 4 ore on 8 ore off.
Il 45% dei marittimi si addormenta , a volte per 30 secondi ma a volte anche di piu’.
I maggiori disastri marittimi in tempi recenti hanno spesso avuto come causa l’affaticamento , basti pensare a disastro dell’ EXXON VALDEZ il maggior caso di inquinamento in Alaska nel 89 e all’incaglio della Shen Neng 1 sulla grande barriere in Aprile 2010.

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SHIP OPERATIONS

Up to 45% of watchkeepers fall asleep on the job
Tuesday 31 January 2012, 16:41

Study reveals that seafarers working six-on, six-off watches fare worst for sleep
UP TO 45% of watchkeepers doze off at least briefly while on watch during a normal working week, according to experiments conducted in a major research project into fatigue at sea.

The findings will be unveiled tomorrow with the publication in London of a report called Project Horizon, a Wake-up Call. The report is sponsored by bodies including classification society Bureau Veritas, the Standard P&I Club, the Maritime and Coastguard Agency, the Marine Accident Investigation Branch, Warsash Maritime Academy and seafarer union Nautilus International.

The shore-based exercise recorded scientific measures of fatigue in various realistic seafaring scenarios, using bridge, engine room and cargo simulators, to assess its impact on decision-making performance.

Some 90 volunteers, all experienced deck and engineering officers, took part in the programme at Chalmers University in Göteberg and Warsash Maritime Academy in Southampton.

The participants worked on simulators for between 64 and 90 hours, spread over seven days. In all four groups of watchkeepers, seafarers fell asleep, mainly during night and early morning watches.
On some teams, up to 45% of the volunteers experienced at least one incident of microsleep, defined as falling asleep for up to 30 seconds.
Analysis of sleeping patterns showed that results were relatively normal for seafarers working on a four-on, eight-off watchkeeping pattern. Those who worked a six-on, six off shift got markedly less sleep, divided between two periods.
Seafarer fatigue has been named as a causal factor in numerous casualties, including the Exxon Valdez oil spill in Alaska in 1989 and grounding of bulk carrier Shen Neng 1 on the Great Barrier Reef in April 2010.