to calibrate for any geological movements of the ground. In Popular Culture The cartoon character "Marvin Marker" is based on a benchmark, and was created to help preserve benchmarking in 1960. References External links Yahoo! Group devoted to the study of the Ordnance Survey triangulation network. The benchmark hunting portion of the Geocaching.com website. Live UK Benchmark Database, primarily focusing on flush bracket benchmarks UK Ordnance Survey benchmark source database, not updated since 1975 UK Trigpoint Database US benchmarks overlaid on a Google Map New England Benchmarks web site UK images of Benchmarks (mostly Gloucestershire) Individual sports Outdoor locating games Surveying and geodesy markers