I can just see what @meako will do with this...
In the days of rapid expansion and exploration maps were essential, and the need for surveyors was great. Surveyors were transported to the new lands by sea, and seamen and surveyors naturally became allies and necessary to each other's trades.
Everyone knows of the traditional work songs, the Sea Chanties. When not at work the sea-faring men would dance jigs to keep time. Jigged bone is an offshoot of this singing and dancing tradition. Scrimshaw done while dancing a jig often as not resembled a roden-gnawed bone. The shipboard surveyors would take this Jigged Bone, and apply it to the knives on which they relied so heavily. This marrying of traditions gave birth to the Jigged Bone Surveyor's Knife. This excellent rendition of the original article is a faithful recreation of the collaboration between the seamen and surveyors of yore.