From WDFW Law Enforcement re licenses off-shore:


There are some nuances depending on commercial versus rec – but essentially, the Magnuson – Stevens Fishery Conservation Act extends state authority to regulate vessels registered under the laws of that state, regardless where they go – out to 200 miles. “registered” has been interpreted to mean a license or significant dependence on a given states port via case law.

The F&W Commission has been granted regulatory authority in offshore waters by the Legislature. So, an Oregon and Washington boat fish together outside WA territory (more than 3 miles offshore) – I can apply the license requirement to the WA vessel, but not the Oregon vessel.