The Alias is used for cross-reference to mark identifiers issued by other organisations. Remarks D Destroyed Evidence was found that the mark was destroyed. Not Found Mark was searched for and not found, however no evidence exists to indicate that it was destroyed. U Uncertain Mark was found, however it was in an unstable condition or there was evidence that it had been disturbed or moved to another location. Status will remain uncertain until verified by survey.
Coordinates are to be used with caution.
S Subsidence Area Mark is located in an area identified by the Mines Subsidence Board as being subject to movement. Coordinates are to be used with caution. F Found Intact Mark was found in good condition. The following are extracts from ICSM SP1 . Order Order is a function of the Class of a survey, the conformity of the new survey data with an existing network coordinate set and the precision of any transformation process required to convert results from one datum to another.