I have mentioned before that our patch is littered with ready reference points which we use when communicating with the Coastguard. It makes sense to make reference to a headland or bay rather than passing a lat and long sometimes. One of the more prominent features on any coastline must always be its lighthouses. Ours is a beauty and is an important reference point for us. Just to the east of the lighthouse stand erect two metal posts. Exactly one nautical mile to the west lie another pair. Together these two pairs of posts are used from the sea by the Navy and indeed anyone else wishing to calibrate instruments. From having one pair exactly in transit to having the next pair exactly in transit is one nautical mile, 1852 metres or one minute (1/60th of a degree) of longitude. Handy if you know what they are!
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