PM58056 Bass Hill, New South Wales, Australia
By
Geocaching Australia on 18-Feb-13. Waypoint TP6633
Cache Details
Difficulty: | |
Terrain: | |
Type: | TrigPoint |
Container: | Other |
Coordinates: | S33° 54.007' E151° 0.304' (WGS 84) |
56H 315542E 6247127N (UTM) | |
Elevation: | 47 m |
Local Government Area: | Canterbury-Bankstown |
Description
Bankstown Testline Pillar 2
This trig like pillar (PM58056) is part of the 'Bankstown Testline' these are use for calibration of survey equipment, their position is known to within 2 millimetres.
A Trig Point is a virtual cache which requires a cacher to locate the Trigonometric Station at GZ.
A trig point (also known as a Trigonometric Station) typically consists of a black disc on top of four metal legs or concrete pillar, resembling a navigation beacon. It is also accompanied by a metal disc, which is located directly below the center point of the tripod or on top of the pillar itself.
Trig points are generally located at the top of hills or points of prominence in the landscape. Many provide unique views and challenges, with some being difficult to get to.
These points were regarded as valuable to surveyors, providing reference points for measuring distance and direction, and assisting in the creation of maps.
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