Nautical measured mile

A nautical measured mile is a nautical mile which is marked by two pairs of towers. A mile is measured by sailing on a given bearing and lining up the pairs of towers. The start of the mile is recorded when the first pair of towers line up and the end of the mile recorded when the second pair line up.

Admiralty distance poles at St Abb's Head.

To accurately measure performance ships must make at least four to six runs in both directions to allow for the wind and tide.[1]

There are several nautical measured miles around the British Isles:

See also

edit

References

edit
  1. ^ Barrass, C. B. (2004). Ship design and performance for masters and mates. Amsterdam: Elsevier/Butterworth-Heinemann. p. 123. ISBN 0-7506-6000-7.
  2. ^ Tony White (March 2003). "Nautical Measured Mile Markers". Polperro village website. Retrieved 11 July 2011.
  3. ^ Richards, George (20 July 1866). "Notice to Mariners". London Gazette. No. 23141. p. 4105.
  4. ^ a b 16 Essex (Map). 1:126,720. Revised half-inch. John Bartholomew and Son. 1962.
  5. ^ Inskip, G. H. (1887). North Sea Pilot. Vol. IV (4 ed.). London: Admiralty Hydrographic Office. p. 12.
  6. ^ North Sea Pilot. Vol. III (Sixth ed.). London: Admiralty Hydrographic Office. 1897. pp. 316–7.
  7. ^ a b "Measured Miles". Secret Scotland. Retrieved 11 July 2011.