Resection simply reverses the intersection process by using crossed back bearings, where the navigator's position is the unknown.
[6] When resecting or fixing a position, the geometric strength (angular disparity) of the mapped points affects the precision and accuracy of the outcome.
[7] Magnetic bearings are observed on the ground from the point under location to two or more features shown on a map of the area.
[12] Resection continues to be employed in land and inshore navigation today, as it is a simple and quick method requiring only an inexpensive magnetic compass and map/chart.
The poor solution stems from the property of a chord subtending equal angles to any other point on the circle.