Silurian is the Hebridean Whale and Dolphin Trust's research vessel which is fitted with an AIS (Automatic Identification System) transponder, allowing people to track her movements 24 hours a day. If the map does not show Silurian's position in the centre screen, it is because she is out of range (e.g. too far offshore). You might need to try again later. When out of range, the map defaults to Silurian's mooring in Tobermory Bay.