Convert chain (US survey) to nautical mile (international)
Please provide values below to convert chain (US survey) [ch (US)] to nautical mile (international) [NM], or Convert nautical mile (international) to chain (US survey).
How to Convert Chain (Us Survey) to Nautical Mile (International)
1 ch (US) = 0.0108622247482181 NM
Example: convert 15 ch (US) to NM:
15 ch (US) = 15 × 0.0108622247482181 NM = 0.162933371223272 NM
Chain (Us Survey) to Nautical Mile (International) Conversion Table
| chain (US survey) | nautical mile (international) |
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Chain (Us Survey)
A U.S. survey chain is a unit of length equal to 66 U.S. survey feet.
History/Origin
The U.S. survey chain is based on the U.S. survey foot, which was slightly different from the international foot. The use of survey units was officially phased out in 2022.
Current Use
The U.S. survey chain was used for land surveying in the United States.
Nautical Mile (International)
The international nautical mile is a unit of length used in marine and air navigation, defined as exactly 1,852 meters.
History/Origin
Historically, a nautical mile was defined as one minute of arc of latitude. The international nautical mile was defined by the First International Extraordinary Hydrographic Conference in Monaco in 1929. The United States adopted it in 1954, and the United Kingdom in 1970.
Current Use
The nautical mile is used for maritime and aviation purposes worldwide.