So what happened to the AIS signals at 0800? This was the time of the VHF transmissions. Would this block out the AIS? Have the positions / speeds been deliberately ‘lost’ by someone?
These AIS plots are all done by amateurs who stick up receivers and upload the data to various servers. I expect the receiving station just went off line or had some other glitch. The Caledonian Isles
, Loch Shira
all disappeared as well. In fact the only two which didn't were the Zagreb
(moored at Hunterston?) and the Paul Schulte
(anchored off Brodick?).
In short: I sure the signals were there and just weren't logged.