EPSG
Norwegian Mapping Authority publication 1990:1 "The transformation between ED50 and WGS84 for exploration purposes in the North Sea".
1996-10-18
Oil and gas exploration and production.
1990 agreement between Denmark, Germany, Great Britain, Netherlands and Norway. Supersedes 1981 6-nations agreement between ED50 and WGS72 or WGS72BE. Only actively used offshore Norway but see ED50 to WGS 84 (24) (code 1613) for simpler transformation.
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