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Several pieces of cross-staffs have been found on the wreck of the Stirling Castle on the Goodwin Sands. One has been assembled from parts of staffs found when the wreck was first investigated, and is currently in the National Maritime Museum, Greenwich. Another part of a staff was found in 2001. It is from a cross-staff rather than a back-staff and, except for broken ends, is in good condition. The problems encountered in using such instruments are linked with the loss of Sir Cloudesley Shovell's fleet in 1707.
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