What Is This Tool?
This tool allows you to convert length measurements from the UK nautical mile, a historic maritime unit, into the US survey furlong, a traditional surveying unit. It supports the interpretation of historical navigation records, land surveys, and legacy documents with ease.
How to Use This Tool?
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Enter the length value in nautical miles (UK)
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Select the original unit as nautical mile (UK) [NM (UK)]
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Choose the target unit as furlong (US survey) [fur]
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Click convert to see the result instantly
Key Features
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Converts from nautical mile (UK) [NM (UK)] to furlong (US survey) [fur]
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Supports historical and legacy unit definitions for accurate conversions
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Browser-based and easy to use with instant calculation
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Includes examples to illustrate typical conversions
Examples
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1 NM (UK) converts to approximately 9.2121 furlongs (US survey)
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5 NM (UK) equals about 46.0605 furlongs (US survey)
Common Use Cases
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Interpreting distances on historic UK maritime charts and logs
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Converting legacy maritime and land survey documents to SI or customary units
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Comparing older navigation data or museum exhibits with modern measurements
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Understanding traditional horse racing distances and historic land measurements
Tips & Best Practices
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Check the historical context of your measurements before converting
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Use the tool to assist with reconciling archival maritime and cadastral data
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Be aware of unit differences when integrating data from multiple legacy sources
Limitations
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The UK nautical mile (NM UK) is a historical unit largely replaced by the international nautical mile
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The US survey furlong is a non-SI, historical unit less recognized in modern surveying
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Minor discrepancies may occur when reconciling measurements from varied legacy sources
Frequently Asked Questions
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What is the UK nautical mile (NM UK)?
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The UK nautical mile, also known as the Admiralty nautical mile, is a historic length unit defined exactly as 6,080 feet or 1,853.184 metres, slightly longer than the international nautical mile.
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What is the US survey furlong?
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The US survey furlong is a traditional surveying unit defined as 660 US survey feet, approximately 201.1684 metres, equal to 1/8 of a US survey mile or 40 rods.
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Why convert from NM (UK) to furlong (US survey)?
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Converting between these units helps interpret historical maritime distances alongside land-based surveying data, aiding research in maritime history, cadastral surveys, and legal land descriptions.
Key Terminology
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Nautical mile (UK) [NM (UK)]
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A historic UK maritime length unit defined as exactly 6,080 feet or 1,853.184 metres.
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Furlong (US survey) [fur]
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A traditional US surveying unit equal to 660 US survey feet, used historically in land descriptions and horse racing.
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Non-SI unit
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A measurement unit not part of the International System of Units, often historical or customary.