Some Chinese coastguard ships deployed in the South China Sea have deliberately made their presence obvious to rival claimants to the waters by turning on tracking signals – a move analysts described as an attempt to assert sovereignty. Collin Koh, a research fellow at the RSIS in Singapore, said allowing the coastguard vessels to be seen was a demonstration of jurisdictional control, and could have a debilitating effect on non-state actors, especially fishermen of those countries who usually operate in their exclusive economic zones.