Originally Posted by
dClbydalpha
Whatever is required, but
Would people need to track a lighthouse BLOS?
What I was hinting at was that ships use AIS to avoid collisions. The fishing boat with injured crewman had AIS but probably not the fancier systems CHC track their assets with. The S-92 transmitted AIS and as a SAR ac would be expected to have AIS detection in order to help find and identify target vessels.
The Black Rock lighthouse appears on MarineTraffic AIS (see below) giving its height, range and light signature. VHF may not work underwater but it will penetrate rain or low cloud better than 19th century flashing lights. One thing it does not appear to have is a
radar beacon whereas
Bull Rock for example does.