Trigonometrical stations are grouped together to form a network of triangulation.
2.
On the north peak erects a pavilion and a trigonometrical station.
3.
Later he was selecting trigonometrical stations on the mountains in South Wales.
4.
An Ordnance Survey trigonometrical station is located at the top of Cupidstownhill.
5.
Thanks to the advent of Global Positioning System technology, the trigonometrical station is now redundant.
6.
In the 1890s Rawnsley's Bluff was home to a trigonometrical station, supporting surveying in South Australia.
7.
It was not until 1853 That a structure was placed on the summit, a trigonometrical station, for survey purposes.
8.
Reference to that cairn does not appear until 1960, when Ordnance Survey Ireland installed a trigonometrical station, partially damaging the cairn.
9.
The peak was used as an unoccupied trigonometrical station by ANARE ( Australian National Antarctic Research Expeditions ) surveyor M . J . Corry in 1965.
10.
Some trigonometrical stations use the Global Positioning System for convenience however the accuracy depends on factors such as ionosphere and troposphere propagation delays errors among other errors.
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