Non-OS marks

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A Facebook page is available for discussing the larger-sized non-OS stations.

Numerous other bolts, rivets and miscellaneous markers exist. These are often found in pavements, bridges and along river banks. Their purpose is sometimes obscure and uninteresting. Here are a few examples:

  • rivet on a step approx locn SE 2807 3702

  • National Rivers Authority block

  • National Rivers Authority bolt

  • National Rivers Authority bolt

  • Environment Agency Bench Mark

  • Environment Agency Bench Mark

  • 'Survey Point' (pavement)

  • 'M A G' (pavement)

  • NRA Fenomark

  • Groundmark - gas pipeline?

  • GPO cable marker; not a benchmark

  • Military boundary marker; not a benchmark

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