My understanding is that "SOLAS vessels must carry a Class A AIS transponder. These operate using SOTDMA broadcast mode and transmit at a power level of 12.5 wa

My understanding is that "SOLAS vessels must carry a Class A AIS transponder. These operate using SOTDMA broadcast mode and transmit at a power level of 12.5 watts. Dynamic information, such as position and course, is transmitted every two to 10 seconds while underway, and every three minutes while at anchor." [1] If "72–76% of the world’s industrial fishing vessels are not publicly tracked", how then are they located by coast guards et al in the situation of misadventure (e.g. sinking, loss of power etc)? [1] https://www.nautinst.org/resources-page/how-ais-works-and-what-it-does.html https://www.nautinst.org/resources-page/how-ais-works-and-wh...