What is an inch (US survey)?

The US survey inch is a length unit equal to 1/12 of the US survey foot and is defined exactly as 100/3937 metres. It was used historically for geodetic and cadastral surveying in the U.S.

What is a fathom (US survey)?

The US survey fathom is a unit equal to 6 US survey feet used in nautical and hydrographic measurements like water depths and line lengths in maritime contexts.

Why convert between these units?

Converting from US survey inches to fathoms helps interpret and reconcile legacy survey and hydrographic data, facilitating its integration into modern mapping and engineering projects.

How to Convert from Inch (US survey) [in] to Fathom (US survey) [fath]

Learn how to convert length measurements from inch (US survey) to fathom (US survey). This tool assists in interpreting historical surveying and nautical data using these legacy units.

Inch (US survey) [in]

Fathom (US survey) [fath]

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

Inch (US survey) [in] to Fathom (US survey) [fath] Conversion Table

Inch (US survey) [in]	Fathom (US survey) [fath]

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.

Inch (US survey) [in] to Fathom (US survey) [fath] Conversion Table
Inch (US survey) [in]	Fathom (US survey) [fath]

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What Is This Tool?

This unit converter allows you to convert length values from the US survey inch to the US survey fathom. It is designed to help interpret and reconcile legacy survey, cadastral, and hydrographic data where these units were historically used.

How to Use This Tool?

Enter the length value in inch (US survey) you want to convert.
Choose the source unit as inch (US survey) and the target unit as fathom (US survey).
Click the convert button to get the equivalent value in fathoms.

Key Features

Converts length values from inch (US survey) to fathom (US survey) with ease.
Supports legacy units used in historical surveying and nautical contexts.
Browser-based tool with a simple and intuitive interface.
Facilitates integration of older survey measurements into modern projects.

Examples

12 inches (US survey) = 0.1666666668 fathoms (US survey)
72 inches (US survey) = 1 fathom (US survey)

Common Use Cases

Interpreting and converting legacy U.S. survey and cadastral records using US survey inches and feet.
Processing legacy geodetic and land-parcel data recorded in US survey units.
Converting historical nautical soundings and depths measured in US survey fathoms.
Reconciling older survey data with modern metric or international-foot measurements.

Tips & Best Practices

Always verify the measurement context to ensure appropriate use of US survey units.
Be mindful of small differences between US survey fathoms and international fathoms when precision is critical.
Use this converter to support integration of historical data into current engineering or mapping workflows.

Limitations

US survey inch and fathom are legacy units; modern work often prefers international feet or SI units.
There are slight differences between the US survey fathom and the international fathom.
Care should be taken with precision as small discrepancies can impact large geospatial datasets.

Frequently Asked Questions

What is an inch (US survey)?: The US survey inch is a length unit equal to 1/12 of the US survey foot and is defined exactly as 100/3937 metres. It was used historically for geodetic and cadastral surveying in the U.S.
What is a fathom (US survey)?: The US survey fathom is a unit equal to 6 US survey feet used in nautical and hydrographic measurements like water depths and line lengths in maritime contexts.
Why convert between these units?: Converting from US survey inches to fathoms helps interpret and reconcile legacy survey and hydrographic data, facilitating its integration into modern mapping and engineering projects.

Key Terminology

Inch (US survey): A legacy length unit equal to 1/12 of the US survey foot, defined exactly as 100/3937 metres.
Fathom (US survey): A non-SI length unit equal to 6 US survey feet, used mainly in nautical and hydrographic measurements.
Legacy Units: Measurement units formerly used in specific contexts such as surveying or nautical work, often replaced by international or metric standards.

Quick Knowledge Check

What is the US survey fathom primarily used for?

Measuring land parcel boundaries

Measuring water depths and nautical line lengths

Converting metric units

How many US survey feet are in one US survey fathom?

1 foot

6 feet

12 feet

The US survey inch is exactly defined as what fraction of a metre?

100/3937 metres

1/39.37 metres

0.0254 metres

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