Paid travel.
In every other industry in the US, employers must pay for all company required travel expenses and pay wages while traveling.
A former engineer now has a job as a service tech. The minute he walks out his door and jumps in his company truck, he is getting paid by the hour. It does not matter whether he is driving to job two hours away or going to the airport to fly to a job 1500 miles away. The company pay for everything, airfare, meals, hotels, uber etc., plus his hourly wages until he walks back in through his front door. And yes, he get a lot of overtime. This is what is normal in American employment. This guy is making much more than he did working on a tugboat.
How dare a maritime employer not pay for all Mariner travel?
What kind of a so-called union would allow that?
In the current job market, why would any Mariner put up with anything less than fully paid travel?