The Rescue-21 system indicates that the transmitter is South of Cape Disappointment Coast Guard station. However, there is no cross bearing to give them a good location.
Local amateur radio operators are asked to monitor 156.800 MHz, no PL, 5 KHz wide (not the new VHF Narrow-band used by public safety agencies). Unfortunately, you will hear routine status announcements & the occasional ship-to-ship transmissions. What you are listening for is the following voice: https://www.dvidshub.net/audio/45774/rescue-21-recording-false-mayday-call
The suspect is described as a white male adult, 35-40 years old, with an accent indicating he is from SE states or the East coast. If you hear such a transmission, note your location, the signal strength, & time.
Phone the Coast Guard tip line at 503-338-9021.