Or maybe less... See:
OTOH. If, as suggested earlier in this thread, the radios are being operated shipboard, that would narrow down the target area substantially. Maybe just take the antenna off of an HT and walk around the docks. If you hear something, you are probably within a few yards of the source.
And, if you actually find the source, what are you going to do? If the FCC does decide to look into it, the ship will be long and far gone.
Our goal has been to give them a printed copy of the relevant FCC rule section, and get the contact number of their communications department or vendor and pass that to the local FCC enforcement folks, and report it to the FCC using their new on-line system. One phone call from the FCC usually has a direct effect. But that is just one company. There are many shipping companies, and it could take years of course as their radios are spread over many countries at any one time.
But I don't have time to do all this....thus the $150k remote controlled solution based on three of more mountain tops to save time. Can't afford that either.
If all the coastal repeater owners started reporting this stuff regularly using their new on-line system, the FCC might listen. We monitor our input in carrier squelch using a local speaker in the office (via two remoterig IP devices) so we know when it occurs.