What is a fathom (US survey)?

The US survey fathom is a unit of length equal to exactly 6 US survey feet. It is used primarily in nautical and hydrographic measurements such as water depths and line lengths.

How long is a UK nautical mile?

The UK nautical mile, historically called the Admiralty nautical mile, is exactly 6,080 feet or 1,853.184 meters, making it slightly longer than the international nautical mile.

Why do I need to convert these units?

Converting these units helps interpret historical maritime data, reconcile legacy surveys, and unify measurements for accurate navigation and archival research.

How to Convert from Fathom (US survey) [fath] to Nautical mile (UK) [NM (UK)]?

Learn how to accurately convert length measurements from the US survey fathom (fath) to the UK nautical mile (NM UK), including key definitions, use cases, examples, and best practices for maritime and historical data.

Fathom (US survey) [fath]

Nautical mile (UK) [NM (UK)]

Please check your input. It must be a valid numeric value.

Fathom (US survey) [fath] to Nautical mile (UK) [NM (UK)] Conversion Table

Fathom (US survey) [fath]	Nautical mile (UK) [NM (UK)]

Custom Unit Conversion Table Generator – Instant Printable Conversion Tables

Start Value

Enter the starting number (positive decimal or integer ≥ 0). Example: 0.1, 1, 5.

End Value

Enter the ending number (positive decimal or integer > Start Value). Example: 10, 50, 100.

Interval

Enter the step size (positive decimal > 0 and < End Value – Start Value). Example: 1.0, 2.5.

Fathom (US survey) [fath] to Nautical mile (UK) [NM (UK)] Conversion Table
Fathom (US survey) [fath]	Nautical mile (UK) [NM (UK)]

Explore More Length Units Converter

What Is This Tool?

This converter allows you to transform measurements in fathoms (US survey) into UK nautical miles (NM UK). It is designed for use in maritime navigation, hydrographic surveys, and interpreting historical nautical data where these specific units are common.

How to Use This Tool?

Enter the length value in fathoms (US survey) in the input field
Select the source unit as fathom (US survey) [fath]
Set the target unit to nautical mile (UK) [NM (UK)]
Click the convert button to view the equivalent measurement

Key Features

Converts length units from US survey fathom to UK nautical mile accurately
Supports maritime and hydrographic measurement needs
Ideal for reconciling legacy survey data and historical nautical charts
Browser-based and easy to use with clear input and output fields

Examples

10 fathoms (US survey) converts to 0.009868441 nautical miles (UK)
100 fathoms (US survey) converts to 0.09868441 nautical miles (UK)

Common Use Cases

Interpreting water depths and line lengths on historical or legacy hydrographic surveys
Specifying anchor cable and mooring line lengths in maritime operations
Converting legacy survey data from US survey units to UK nautical mile for maritime navigation
Reconciling historical UK Admiralty maritime distances and charts
Comparing results from older navigation instruments or maritime legal documents

Tips & Best Practices

Be aware of slight differences between US survey and international fathoms
Note that UK nautical miles are slightly longer than international nautical miles
Use this conversion to unify legacy units with modern measurements for consistency
Apply caution with high-precision navigational data where small rounding errors may be significant

Limitations

The US survey fathom differs slightly from the international fathom measurement
The UK nautical mile is not the same length as the international nautical mile
Rounding differences may impact high-precision hydrographic and navigational calculations
Care must be taken when using legacy data for precise maritime applications

Frequently Asked Questions

What is a fathom (US survey)?: The US survey fathom is a unit of length equal to exactly 6 US survey feet. It is used primarily in nautical and hydrographic measurements such as water depths and line lengths.
How long is a UK nautical mile?: The UK nautical mile, historically called the Admiralty nautical mile, is exactly 6,080 feet or 1,853.184 meters, making it slightly longer than the international nautical mile.
Why do I need to convert these units?: Converting these units helps interpret historical maritime data, reconcile legacy surveys, and unify measurements for accurate navigation and archival research.

Key Terminology

Fathom (US survey): A length unit equal to 6 US survey feet, used in nautical contexts for depth and line measurements.
Nautical mile (UK): A UK-based unit of distance defined as exactly 6,080 feet, historically used in Admiralty navigation.
Legacy Data: Historical or older measurement data using outdated or non-standard units requiring conversion to modern units.

Quick Knowledge Check

What type of measurement is a fathom (US survey)?

Weight

Length

Volume

The UK nautical mile is historically known as what?

International nautical mile

Admiralty nautical mile

Survey mile

Why is careful conversion between these units important?

Because units are identical

Slight differences affect precise navigation

Conversion is rarely needed

Share Us

Similar Calculators

Online Surface Current Density Units Converter Online Heat Flux Density Units Converter Online Heat Density Units Converter Online Weight and Mass Units Converter Online Flow Molar Units Converter