A survey Chain from Edmund Gunter's system having 100 metal links and being 66 feet, or 4 rods, in length. Used in land surveying. One chain (Gunter's Surveyor's)is 4 rods, 22 yards, or 66 feet. 1 ch (Gunter's Surveyor's) = 20.1168 m (SI base unit).
1 Rope (H):
Rope is former English unit measuring 20 feet in length. Other variations exist. In SI Units a rope of 20 feet is 6.096 meters. 1 rope = 6.096 m.