Track a ship when AIS is switched of

By Curious

US Office of Naval Research change existing technologies to designed an innovative tracking system of the AIS 'silent'.
The Navy in no time will get a leg by using so called 'Rough Rhino', an electronic system for displaying the location of fisherman catching fish illegally, drug smugglers, pirate gangs, human traffickers at sea who don’t want to be discovered and thus that switch off their AIS systems.
Which technologies are available now?
It's possible vessels to track other ships not transmitting AIS if they are within the horizon, or about 25 to 35 miles,. To see beyond that point, vessels have to receive data from the sky, from a plane for example.
Rough Rhino, although, will deliver the required data to Navy vessels for displaying vessels far away with the help of a radar and using optics to identify them. Pollock told that the software program will help sailors to receive data and this information to be displayed on their radar.
This new system was tested in an operational environment off the coast of West Africa in recent exercise in partnership with several African countries. Host nations Senegal, Cape Verde and Gambia tried the new technology to find more than 600 illegal fishermen, drug smugglers and human traffickers a day, and boarded 24 vessels in this time AMLEP. The system was installed to be tested on the frigate Simpson as well as 2 Senegalese vessels in the time of the exercise.