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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.
Nautical miles measure distance. 1 nautical mile is the angular distance of 1 minute of arc on the earth's surface. As these differ slightly (6108' at pole c.f. 6046' at equator) 6080 was adopted (this being it's approximate value in the English Channel). The International nautical mile is 1852 metres, so is very slightly different from the UK nautical mile.
| Chains | UK Nautical Miles |
|---|---|
| 0ch | 0.00UK nmi |
| 1ch | 0.01UK nmi |
| 2ch | 0.02UK nmi |
| 3ch | 0.03UK nmi |
| 4ch | 0.04UK nmi |
| 5ch | 0.05UK nmi |
| 6ch | 0.07UK nmi |
| 7ch | 0.08UK nmi |
| 8ch | 0.09UK nmi |
| 9ch | 0.10UK nmi |
| 10ch | 0.11UK nmi |
| 11ch | 0.12UK nmi |
| 12ch | 0.13UK nmi |
| 13ch | 0.14UK nmi |
| 14ch | 0.15UK nmi |
| 15ch | 0.16UK nmi |
| 16ch | 0.17UK nmi |
| 17ch | 0.18UK nmi |
| 18ch | 0.20UK nmi |
| 19ch | 0.21UK nmi |
| Chains | UK Nautical Miles |
|---|---|
| 20ch | 0.22UK nmi |
| 21ch | 0.23UK nmi |
| 22ch | 0.24UK nmi |
| 23ch | 0.25UK nmi |
| 24ch | 0.26UK nmi |
| 25ch | 0.27UK nmi |
| 26ch | 0.28UK nmi |
| 27ch | 0.29UK nmi |
| 28ch | 0.30UK nmi |
| 29ch | 0.31UK nmi |
| 30ch | 0.33UK nmi |
| 31ch | 0.34UK nmi |
| 32ch | 0.35UK nmi |
| 33ch | 0.36UK nmi |
| 34ch | 0.37UK nmi |
| 35ch | 0.38UK nmi |
| 36ch | 0.39UK nmi |
| 37ch | 0.40UK nmi |
| 38ch | 0.41UK nmi |
| 39ch | 0.42UK nmi |
| Chains | UK Nautical Miles |
|---|---|
| 40ch | 0.43UK nmi |
| 41ch | 0.45UK nmi |
| 42ch | 0.46UK nmi |
| 43ch | 0.47UK nmi |
| 44ch | 0.48UK nmi |
| 45ch | 0.49UK nmi |
| 46ch | 0.50UK nmi |
| 47ch | 0.51UK nmi |
| 48ch | 0.52UK nmi |
| 49ch | 0.53UK nmi |
| 50ch | 0.54UK nmi |
| 51ch | 0.55UK nmi |
| 52ch | 0.56UK nmi |
| 53ch | 0.58UK nmi |
| 54ch | 0.59UK nmi |
| 55ch | 0.60UK nmi |
| 56ch | 0.61UK nmi |
| 57ch | 0.62UK nmi |
| 58ch | 0.63UK nmi |
| 59ch | 0.64UK nmi |