4 天之前 · A Facebook group where you can post your photos of the bench marks of the British Isles. The top ten users for 2025 based on the number of marks logged are Seth7, Earby, …

2018 marked 25 years since the last traditionally-cut arrow style Ordnance Survey benchmark were carved. There were over 500,000 benchmarks created. On the map you will see that they …

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.

The Ordnance Survey (OS) benchmarks were developed during the 19th century, and used for many years as the basis of mapping within the UK. Only the Fundamental Benchmarks are still maintained, although the many thousands of other benchmarks still exist to this day.

2018年5月1日 · Here at OS, we have created a map of all the benchmarks in Great Britain. Find out more about the different types of benchmarks and have a read of our archive. Sharing the …

They are domed metal bolts about 1" (50-60mm) in diameter fixed to horizontal surfaces engraved with OSBM and the benchmark symbol. By far the most common type. Used and made from …

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Search records of survey bench marks in Britain, Ireland, the Isle of Man, the Channel Islands and Gibraltar.

2025年4月4日 · The bench mark database contains records of survey bench marks in Great Britain, Ireland, the Isle of Man, the Channel Islands and Gibraltar.

Bench marks are the visible remains of height measurements made by the Ordnance Survey. When used in conjunction with older Ordnance Survey maps they indicate the height above sea level at the point of the bench mark. The maps show a bench mark symbol, the letters BM (or B.M.) and the measured height above sea level.