Trig-pointing

Trigonometrical stations, commonly referred to as Trigs, are fixed survey points placed at the highest peak of a mountain or hill. Often visible to at least two other surrounding trigs, they form a network of triangulations.

The characteristic white metal quadripods with black discs were installed in the 1970s as part of the ACT Precision Zone, and formed part of a national geodetic survey. The ACT Precision Zone and its associated marks have been the main surveying infrastructure for all new development in the ACT since the early 1970s.

Trigonometrical Station on a hill in the distance