I think it’s probably too apples to oranges to try and equate to any sort of cargo vessel. My maintenance department alone on a drillship was about 30 people. Add maybe 11 in marine dept, prob 40 between drilling and crane depts. So around 80 rig crew, but since there’s two crews that’s benefits for 160 at any given time, plus travel for at least half of them every three weeks. Cooks and stewards are generally 3rd party but hired by the rig not the oil co. 100 total personnel onboard being paid directly or indirectly by the rig probably isn’t that far off. Like I said, too different an industry to try to reconcile against an LNG tanker.
I do wonder if increasing OSV pay in the GOM is due to the combination of higher day rates and it being long overdue, or also related to labor competition from north east wind crew boats.