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After walking back from Bakers spinney i had a look in my geo bag and all i had left was a 35mm pot. I know we all hate a 35mm's in the ivy tree.
So there we have it a 35mm to kick off my dog walking route to Baker's spinney.
Don't take any short cuts...?
If you look South to South East there is a triangulation point i've included a waypoint for those you who want to explore.
There is a route up the hedge row to another waypoint where i used the tractor track to get up close..
The trig point – or triangulation point - was instrumental in this geodetic survey. They were workstations and reference points for the surveyor, who could attach his theodolite equipment to the fixtures and fittings within the column, including the three-pronged metal plate in the top of the trig point.
The location of each trig point was selected so that at least two others would be visible from it. Using these, the surveyor could work out the angles on the lines of sight between the three points and create a triangular mapping grid – hence, triangulation.
Each trig point also contains another plate, usually low down on one side, featuring the bench mark of that particular trig point and the letters OSBM, for Ordnance Survey Bench Mark.
Their use has now been superseded by aerial photography and satellite mapping, and some have been removed so as to restore the natural state of the landscape they stood on. Most remain, however, as they’re a massively useful navigational aid for walkers, not least for the simple act of confirming you’ve reached the summit of something, especially in mist.
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