Course Planning - Parallax

Extreme care must be taken with the map survey and the placement of the circles, the centre of which must represent exactly the placement of one of the cluster of posts.

Section of Strinesdale map

Take control 6 for example. In view 1, seen from the NE, the centre is round the leftmost 'A' post.
View from NE

View 2, from the NNE, gives an apparently different post setting although the answer is still 'A'.
View from NNE

A third decision position, seen from the N is shown in View 3, in this case the answer is 'B'.
View from N

Refer back to View 1 and the map as viewed from the north. If the circle were now to be centred on the 'C' post a further set of answers would be available.

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