Not long after Gulf War 2 I saw a report on RN refuelling ops just outside the Gulf at a classified position which was often changed for reasons of security.
Well, I checked a AIS ship spotting site and there was a UK tanker loitering in the area happily broadcasting its location to the world.
I contacted a Tanker Mooring Master friend who was ex-RN, He contacted a RN friend of some high rank and told him the tanker’s name , location, track were readily available on the internet and that someone had probably not turned off the guilty AIS box. The fellow was most surprised to learn of this and said some very bad words.
By the next morning it was off and probably disconnected with extreme prejudice. I would have liked to have seen a copy of that message from Admiralty to the Commander of the vessel concerned and seen his reaction. There were probably some new rules and procedures promulgated ASAP.