It’s worth investigating the US Academic Research Fleet (aka UNOLS, www.unols.org). Better than 50% of the fleet is limited license, and they’re always looking for people (and will have 3 new limited license ships coming on line in the next couple of years.)
Current midpoint yearly pay at the university I work for is $85,860 for a Master or Chief Mate (we require C/Ms to have a Master’s license), $119,232 for a Chief Engineer. (These are likely to go up soon.)
But: this also includes OT, full vacation/sick leave/shore leave, sea pay, medical and retirement benefits.
The downsides: you generally have to live within a reasonable distance of the ship’s homeport, it is a year-round permanent job (at a standard 40-hour week while inport; ideal schedule for a year is 180-200 days at sea), and with research ships there is no set rotation (though most institutions try to arrange vacation schedules well in advance to get a relief and give you a reasonable break.)
The upside: it’s a lot more interesting work than hauling containers of rubber duckies from Point A to Point B. Something new every mission.