Free station or two points resection

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 Free stationing in surveying (is also known as two point resection) is a method of determining a location of one unknown point in relation to known points. The instrument can be freely positioned so that all survey points are at a suitable sight from the instrument. Is very fast resection method using only two control points, to which bearings and distances are measured, so the position and orientation of the instrument can be established easily. 

  The method is very fast but the results must be checked properly because of the errors at the "limit" values of the angles.  

Example:

Application:

Gradians (gons)

Decimal degrees (deg)