The West Coast of Scotland plays host to the majority of submarine exercises in the UK. The map below shows where RN and NATO submarines routinely exercise and warnings to fishing boats are broadcast daily by the Coastguard.

Known as the 'Subfacts' scheme, broadcasting of areas where submarines are due to exercise was introduced on the Upper Clyde following the sinking of the Antares trawler in November 1990 and then extended to cover the shaded areas in 2002.

The chart below shows the break down of the exercise areas between the Western Isles and the mainland, including the QinetiQ ranges at Rona, Applecross and the Kyle of Lachalsh as well as areas close to Cape Wrath. Each area where submerged submarines may be present is broadcast by the Coastguard twice daily on MF and VHF. The Marine Rescue Co-ordination Centre at Clyde broadcasts 'Subfacts' six times daily.

(Taken from:
www.royal-navy.mod.uk/static/pages/data/%5B(1423)-08-07-2002%5DUK%20FV%20Code%20for%20www.pdf)