What Is This Tool?
This converter allows you to change length values from foot (US survey) units to nautical mile (UK) units, supporting the interpretation of historical and geodetic survey data, maritime navigation, and legacy measurement systems.
How to Use This Tool?
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Enter your value in foot (US survey) units into the input field
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Select foot (US survey) as the original unit if needed
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Choose nautical mile (UK) as the target unit for conversion
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Click the convert button to see the result in NM (UK)
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Use the result to interpret historical or maritime distances accurately
Key Features
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Converts foot (US survey) [ft] to nautical mile (UK) [NM (UK)] accurately based on legacy definitions
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Supports converting historical land surveying and maritime navigation measurements
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Browser-based and easy to use without installation
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Enables handling of cadastral survey data and maritime chart distances
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Ideal for users working with older UK Admiralty nautical miles and US survey feet
Examples
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1,000 feet (US survey) converts to 0.164474 nautical miles (UK)
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5,000 feet (US survey) equals 0.82237 nautical miles (UK)
Common Use Cases
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Translating historical land survey boundary measurements into maritime units
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Interpreting UK Admiralty nautical miles on old navigation charts
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Converting maritime distances in legacy legal and geodetic records
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Restoring and comparing older navigation instruments referencing UK units
Tips & Best Practices
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Verify the original unit system before performing conversions to avoid errors
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Cross-check converted values when working with historical datasets to maintain accuracy
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Be aware of slight differences between UK and international nautical mile definitions
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Use consistent units when comparing or compiling multiple datasets
Limitations
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Units are based on legacy definitions that may differ slightly from current international standards
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Conversion results might not perfectly align with the international nautical mile
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Handling historical data requires caution to preserve measurement accuracy
Frequently Asked Questions
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Why is the foot (US survey) different from other feet?
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The foot (US survey) is defined exactly as 1200/3937 meters and is used mainly in US land surveying and mapping, differing slightly from other foot definitions.
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What makes the UK nautical mile distinct?
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The UK nautical mile, also known as the Admiralty nautical mile, is defined as exactly 6,080 feet or 1,853.184 meters, making it slightly longer than the international nautical mile.
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Can this tool be used for modern nautical miles?
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This converter specifically handles the UK nautical mile (NM UK) and may not reflect conversions for the modern international nautical mile.
Key Terminology
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Foot (US survey) [ft]
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A unit of length used historically in US land surveying, defined as exactly 1200/3937 meters.
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Nautical mile (UK) [NM (UK)]
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A historical UK nautical mile, known as the Admiralty mile, defined as exactly 6,080 feet or 1,853.184 meters.
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Legacy Definitions
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Older unit definitions used in historical contexts which may vary slightly from modern international standards.