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When planning to perform a resection, the surveyor must first plot the locations of the known points along with the approximate unknown point of observation. If all points, including the unknown point, lie close to a circle that can be placed on all four points, then there is no solution or the high risk of an erroneous solution. This is known as observing on the "danger circle". The poor solution stems from the property of a chord subtending equal angles to any other point on the circle.
==Notes==▼
{{reflist}}▼
==References==▼
* Mooers Jr., Robert L., ''Finding Your Way In The Outdoors'', Outdoor Life Press (1972), ISBN 0-943822-41-6▼
* Kals, W.S., Practical Navigation, New York: Doubleday & Co. (1972), ISBN 0-385-00246-7▼
* Seidman, David, and Cleveland, Paul, ''The Essential Wilderness Navigator'', Ragged Mountain Press (2001), ISBN 0-07-136110-3▼
==See also==
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* [[Position fixing]]
* [[Solving triangles]]
▲==Notes==
▲{{reflist}}
▲==References==
▲* Mooers Jr., Robert L., ''Finding Your Way In The Outdoors'', Outdoor Life Press (1972), ISBN 0-943822-41-6
▲* Kals, W.S., Practical Navigation, New York: Doubleday & Co. (1972), ISBN 0-385-00246-7
▲* Seidman, David, and Cleveland, Paul, ''The Essential Wilderness Navigator'', Ragged Mountain Press (2001), ISBN 0-07-136110-3
==External links==
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