John,
Apologies on the figures!
As for single pilot ops, I was still doing crew changes from Unst out to the Ninians single pilot in 1992. Yes, most of the flying was inter rig shuttles, but it was common the fly up to three pax in and out of Unst if the loads were too high for the S61s.
As for DECCA DANAC, yes it was the best at the time. But that's precisely my point - things have improved. New technology, new ways of operating etc. That's what should happen, isn't it? We have to keep pushing for better kit, better understanding of the environmental conditions we operate in.
bondu