The WN number is a start, but the letters following the number are also needed. Not sure if WA Parks is set up to do a registration check on a partial number, but it could narrow the search for vessel, especially with a description available. Tribal registrations are usually followed by tribal identification letters. On the NOP, we see PGK for Port Gamble Klallam, JST for Jamestown, and LEK for Lower Elwha Klallam. Not sure what system other tribes might be using. If similar lettering is used, it shouldn't be too hard for LE to run the WN number and add the tribal letters.......

Calling 911 is the best start here. The poaching hotline is not very efficient. Some folks have cell numbers for the local WDFW officer which can be useful if they're on duty. Pictures are also helpful - cell phone or camera to document vessel(s), people, etc. Try to get some background, too, so that the area can be identified.