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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.
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.
| Chains | US Nautical Miles |
|---|---|
| 0ch | 0.00US nmi |
| 1ch | 0.01US nmi |
| 2ch | 0.02US nmi |
| 3ch | 0.03US nmi |
| 4ch | 0.04US nmi |
| 5ch | 0.05US nmi |
| 6ch | 0.07US nmi |
| 7ch | 0.08US nmi |
| 8ch | 0.09US nmi |
| 9ch | 0.10US nmi |
| 10ch | 0.11US nmi |
| 11ch | 0.12US nmi |
| 12ch | 0.13US nmi |
| 13ch | 0.14US nmi |
| 14ch | 0.15US nmi |
| 15ch | 0.16US nmi |
| 16ch | 0.17US nmi |
| 17ch | 0.18US nmi |
| 18ch | 0.20US nmi |
| 19ch | 0.21US nmi |
| Chains | US Nautical Miles |
|---|---|
| 20ch | 0.22US nmi |
| 21ch | 0.23US nmi |
| 22ch | 0.24US nmi |
| 23ch | 0.25US nmi |
| 24ch | 0.26US nmi |
| 25ch | 0.27US nmi |
| 26ch | 0.28US nmi |
| 27ch | 0.29US nmi |
| 28ch | 0.30US nmi |
| 29ch | 0.32US nmi |
| 30ch | 0.33US nmi |
| 31ch | 0.34US nmi |
| 32ch | 0.35US nmi |
| 33ch | 0.36US nmi |
| 34ch | 0.37US nmi |
| 35ch | 0.38US nmi |
| 36ch | 0.39US nmi |
| 37ch | 0.40US nmi |
| 38ch | 0.41US nmi |
| 39ch | 0.42US nmi |
| Chains | US Nautical Miles |
|---|---|
| 40ch | 0.43US nmi |
| 41ch | 0.45US nmi |
| 42ch | 0.46US nmi |
| 43ch | 0.47US nmi |
| 44ch | 0.48US nmi |
| 45ch | 0.49US nmi |
| 46ch | 0.50US nmi |
| 47ch | 0.51US nmi |
| 48ch | 0.52US nmi |
| 49ch | 0.53US nmi |
| 50ch | 0.54US nmi |
| 51ch | 0.55US nmi |
| 52ch | 0.56US nmi |
| 53ch | 0.58US nmi |
| 54ch | 0.59US nmi |
| 55ch | 0.60US nmi |
| 56ch | 0.61US nmi |
| 57ch | 0.62US nmi |
| 58ch | 0.63US nmi |
| 59ch | 0.64US nmi |