Are Benchmarks Shown on Os Maps?

Yes, you heard right. So if you're an avid benchmark bagger or just intrigued by geographical history, you'll be delighted to know that, instead of downloading our benchmark archive, you can simply find them on OS Maps desktop.

How do you find OS benchmarks?

Ordnance Survey Bench marks (BMs) are survey marks made by Ordnance Survey to record height above Ordnance Datum. If the exact height of one BM is known, the exact height of the next can be found by measuring the difference in heights, through a process of spirit levelling.

How are benchmarks shown on maps?

A fundamental benchmark is a point with a precisely known relationship to the vertical datum of the area, typically mean sea level. The position and height of each benchmark is shown on large-scale maps.