My own experience of 'OFFSHORE TAPESTRY' included a NATO exercise c.1985 (probably OCEAN SAFARI) which involved an incident when I was flying from Inverness to Orkney in a Loganair Islander. I was sitting up front and discovered that the pilot was an ex-FAA Buccaneer pilot who specialised in 'dentology', i.e. the identification of Warsaw Pact ships from any obvious damage to their hulls and superstructure as they kept changing their pendant numbers. We were south-east of Orkney when we spotted an 'ORANGE' German U-boat at PD (periscope depth) and he called it in to the control tower at Kirkwall. Within an hour, the control tower had contacted the Port HQ and a trio of 'BLUE' German frigates had sailed from their anchorage in Scapa Flow and 'sunk' their enemy countrymen.