Turning point

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1. In surveying, a hub used on hilly terrain to allow the surveyor's instrument to be moved to another location, where a new height of the instrument (HI) can be established to allow surveying to continue.

photo31.gif

This shows a surveyor on a rough terrain and the instruments used in this process

Source:www.aad.gov.au/asset/ aadc/surveying/photo31.gif