One thing I overlooked in my little 'spout' below, is how much time seafarers of today have to spend doing paperwork!
Since ISM was introduced in 2000, the amount of time required to be spent on record-keeping for bunkers, MARPOL, Port State inspections, crew training exercises & Certificate of Competence validities, cargo records, ballast exchanges, Planned Maintenance System records, medical locker records, critical machinery records, etc, etc, has multiplied to a huge degree, mainly to keep an auditable record of events in case of an incident. The Voyage Data Recorder also records the telegraphs & movements, ship position, speed & course, and numerous other bits besides.
30 Years ago, most of this paperwork requirement didn't exist to anywhere near the volumes required today. And nowadays, the companies who require all this paperwork to be completed are also making it their prime goal to reduce the ship's manning! So who does all this extra work! The watchkeeper is not meant to be doing this stuff - he is meant to be on watch! However, to keep up with the ever-increasing demand to have records, it is invariably the watchkeeper who ends up doing it, which takes his concentration off his prime reason for being on watch!
I have written a couple of SOPEPS (Ships Oil Pollution Emergency Plan) during the 1990's, but I was banged up at the time with a couple of crushed vertebrae so couldn't pass the sea-going medical anyway. It kept my mind working during the long days of concentration, and I was quite chuffed to receive them back from Lloyd's of London with 'Approved - No Alterations Required' stamped through them. For someone on the ships to have done them while operating would have been impossible.
So, what I am emphasising is that there are many more distractions for watchkeepers today - maybe too many. In good daylight conditions, some ships now operate with only the OOW on the bridge (cargo vessels I mean - I have yet to see this practice on any passenger vessel I have been on). If the OOW falls over & becomes incapable, who will know, unless there is a dead man system installed? The only 3 ships I have been on with Dead Man systems installed, they had been deactivated! Go Figure?