Length and Distance ConversionsWiki How

How Many Fathoms in a Shackle?

In the maritime industry, a shackle is a commonly used unit of length, and it’s crucial to understand its relationship with other maritime measurements. A shackle is defined as 1/120th of a nautical mile, while a fathom, another maritime unit of length, is equivalent to 6 feet.

So, let’s break down these conversions:

1 Shackle = 1/120th of a Nautical Mile 1 Fathom = 6 Feet

With these conversions in mind, we can calculate that:

1 Shackle = 6 Feet (because 1/120th of a Nautical Mile is equal to 6 feet)

Now, let’s provide a conversion table for reference:

Conversion Table:


Imagine a ship is sailing at a speed of 10 knots. In the maritime world, one knot is defined as one nautical mile per hour. To calculate the ship’s speed in feet per hour, we use the conversion factor:

10 knots x 6,076 feet per nautical mile = 60,760 feet per hour

So, if the ship continues to travel at this speed for one hour, it will cover a distance of 60,760 feet. Now, let’s find out how many shackles this distance represents:

60,760 feet ÷ 6 feet per shackle = 10,126 shackles

FAQs (Frequently Asked Questions):

What is a shackle in the maritime industry?

A shackle is a unit of length used in the maritime industry, equal to 1/120th of a nautical mile.

How long is a fathom in feet?

A fathom is equivalent to 6 feet.

What is a nautical mile in feet?

A nautical mile is equal to 6,076 feet.

How can I convert knots to feet per hour?

To convert knots to feet per hour, multiply the speed in knots by 6,076 (the number of feet in a nautical mile).

Why is the shackle measurement important in the maritime industry?

The shackle is a crucial measurement for determining distances between objects in the maritime industry, aiding navigation and ensuring safe passage for ships at sea.


In summary, there are 6 fathoms in a shackle, making it a vital unit of measurement in the maritime industry. Shackles, fathoms, and nautical miles are all integral to ensuring accurate navigation and distance measurement at sea.

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