KnowraCross-staffLinked fromLinked fromThe 6 pages that link to Cross-staff, each with the reason it gives.All 6Related 3Compared with 3Celestial navigationRelated: It was an early tool for measuring the angular heights used in navigation.Edmund GunterRelated: It belongs to the instrument-making tradition Gunter applied to surveying and navigation.Jacob’s staffRelated: This common name emphasizes the staff-and-transom arrangement used in the same measuring principle.