WATCH THE WATER
Dasting article here about a company using RF satellite detection to determine where ships actually are. They are comparing this to the AIS tracking system that ships are supposed to be using.
They found at least 60% of Chinese ships not showing up on AIS in Chinese waters. These 'little blue men' are part of a well known maritime militia.
"It's unknown how many of these vessels might be part of the country's irregular maritime militias due to how these fleets operate. Commercial vessels and fishing fleets often coordinate with the People's Liberation Army Navy (PLAN) in order to harass ships operating in international waters. Not being able to accurately track these vessels, either part of the maritime militias or general fishing fleets, has a significant impact on general transparency and potentially helps China conceal these activities."
https://www.thedrive.com/the-war-zone/44390/scores-of-dark-vessels-belonging-to-chinas-maritime-militias-are-operating-in-contested-waters