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A unit of length used in marine navigation that is equal to a minute of arc of a great circle on a sphere. One international nautical mile is equivalent to 1,852 meters or 1.151 statue miles. Please not that this is different to a UK Nautical mile.
Unit of length equal to 66 feet, used especially in the U.S. public land surveys. The original measuring instrument (Gunter's chain) was literally a chain consisting of 100 iron links, each 7.92 inches long. Steel-ribbon tapes began to supersede chains around 1900, but surveying tapes are often still called "chains" and measuring with a tape is often called "chaining". The chain is a convenient unit in cadastral surveys because 10 square chains equal 1 acre.
| US Nautical Miles | Chains |
|---|---|
| 0US nmi | 0.00ch |
| 1US nmi | 92.06ch |
| 2US nmi | 184.12ch |
| 3US nmi | 276.19ch |
| 4US nmi | 368.25ch |
| 5US nmi | 460.31ch |
| 6US nmi | 552.37ch |
| 7US nmi | 644.44ch |
| 8US nmi | 736.50ch |
| 9US nmi | 828.56ch |
| 10US nmi | 920.62ch |
| 11US nmi | 1012.68ch |
| 12US nmi | 1104.75ch |
| 13US nmi | 1196.81ch |
| 14US nmi | 1288.87ch |
| 15US nmi | 1380.93ch |
| 16US nmi | 1472.99ch |
| 17US nmi | 1565.06ch |
| 18US nmi | 1657.12ch |
| 19US nmi | 1749.18ch |
| US Nautical Miles | Chains |
|---|---|
| 20US nmi | 1841.24ch |
| 21US nmi | 1933.31ch |
| 22US nmi | 2025.37ch |
| 23US nmi | 2117.43ch |
| 24US nmi | 2209.49ch |
| 25US nmi | 2301.55ch |
| 26US nmi | 2393.62ch |
| 27US nmi | 2485.68ch |
| 28US nmi | 2577.74ch |
| 29US nmi | 2669.80ch |
| 30US nmi | 2761.87ch |
| 31US nmi | 2853.93ch |
| 32US nmi | 2945.99ch |
| 33US nmi | 3038.05ch |
| 34US nmi | 3130.11ch |
| 35US nmi | 3222.18ch |
| 36US nmi | 3314.24ch |
| 37US nmi | 3406.30ch |
| 38US nmi | 3498.36ch |
| 39US nmi | 3590.42ch |
| US Nautical Miles | Chains |
|---|---|
| 40US nmi | 3682.49ch |
| 41US nmi | 3774.55ch |
| 42US nmi | 3866.61ch |
| 43US nmi | 3958.67ch |
| 44US nmi | 4050.74ch |
| 45US nmi | 4142.80ch |
| 46US nmi | 4234.86ch |
| 47US nmi | 4326.92ch |
| 48US nmi | 4418.98ch |
| 49US nmi | 4511.05ch |
| 50US nmi | 4603.11ch |
| 51US nmi | 4695.17ch |
| 52US nmi | 4787.23ch |
| 53US nmi | 4879.30ch |
| 54US nmi | 4971.36ch |
| 55US nmi | 5063.42ch |
| 56US nmi | 5155.48ch |
| 57US nmi | 5247.54ch |
| 58US nmi | 5339.61ch |
| 59US nmi | 5431.67ch |