Three identifiable objects are selected on the chart and if the horizontal angles are measured between the three objects, a very accurate 'fix' can be obtained.
Izinto ezintathu ezikwaziyo ukwalathwa zikhethwe etshatini kwaye ukuba imbombo ezime ngokobude ezilunganiselwa phakathi kwezinto ezintathu, eyanto ndlela yokulungisa ithe ngqo ingafumaneka.