The Chain (Gunter's chain) was fundamental in surveying the American frontier. Measuring 66 feet (4 rods), it's the length of a cricket pitch. Ten square chains make an acre. Modern surveyors still reference chains in legal descriptions, and the unit remains visible in rural road layouts across the US. The Nautical Mile is used for global navigation, equaling one minute of latitude (about 1.15 statute miles). Commercial airliners cruise at altitudes of 35,000-40,000 feet (about 6 nautical miles). Modern nautical charts still use this measurement, and international maritime law specifies territorial waters in nautical miles.
To convert between Chain (ch) and Nautical Mile (nmi), use the following formulas:
1 Chain (ch) = 0.0108622030237581 Nautical Mile (nmi)
1 Nautical Mile (nmi) = 92.06235584188339 Chain (ch)
1 ch = 1 * 0.0108622030237581 nmi = 0.0108622030237581 nmi
5 ch = 5 * 0.0108622030237581 nmi = 0.0543110151187905 nmi
10 ch = 10 * 0.0108622030237581 nmi = 0.108622030237581 nmi
20 ch = 20 * 0.0108622030237581 nmi = 0.217244060475162 nmi
50 ch = 50 * 0.0108622030237581 nmi = 0.5431101511879051 nmi
100 ch = 100 * 0.0108622030237581 nmi = 1.0862203023758101 nmi
| Chain (ch) | Nautical Mile (nmi) |
|---|---|
| 1 ch | 0.0108622030237581 nmi |
| 5 ch | 0.0543110151187905 nmi |
| 10 ch | 0.108622030237581 nmi |
| 20 ch | 0.217244060475162 nmi |
| 50 ch | 0.5431101511879051 nmi |
| 100 ch | 1.0862203023758101 nmi |