Cable Length (cb) - Unit Information & Conversion
What is a Cable Length?
Definition
A Cable Length (symbol cb), often shortened to cable, is a nautical unit of length, traditionally related to the length of a ship's anchor cable. While its exact length has varied historically and geographically, it is now most commonly defined internationally as one-tenth of a nautical mile (1/10 NM).
This standard definition equates to:
- 185.2 meters (m)
- Approximately 607.61 feet (ft)
- Approximately 202.54 yards (yd)
Other historical definitions based on the fathom also exist.
History
The unit originated from the practical length of a ship's anchor cable (or "shot" of chain) used in the age of sail. Anchor cables were typically manufactured in standard lengths that could be shackled together. This length provided a convenient unit for measuring distances related to anchoring and maneuvering close to shore or other vessels.
However, the length was not universally standardized:
- In the British Royal Navy, a cable was traditionally defined as 100 fathoms (equivalent to 600 feet or 182.88 meters).
- In the U.S. Navy, it was often defined as 120 fathoms (equivalent to 720 feet or 219.456 meters).
With the international adoption of the nautical mile (defined as 1852 meters), defining the cable as exactly one-tenth of this value (185.2 m) created a convenient, decimal-based relationship and became the most common modern standard, sometimes referred to as the "international cable length".
Common Uses
The cable length, particularly the 1/10 NM definition, remains in use in specific maritime contexts:
- Nautical Navigation & Ship Handling: Measuring short distances at sea, such as the distance between ships in formation, distance off a navigational hazard, distance to a pier, estimating anchor drag, or describing the scope (length) of anchor cable paid out.
- Hydrographic Surveying: Historically used on nautical charts, although meters are now the primary international standard for depth and short distances on modern charts.
- Naval Terminology: Persists in naval traditions and communications for describing close ranges.
- Historical Context: Encountered in older maritime texts, logs, charts, and naval records.
Unit FAQs
What are the different values for a cable length?
The value depends on the definition being used:
- International Standard: 1 cable = 1/10 nautical mile = 185.2 meters ≈ 607.61 feet. (Most common modern definition)
- British Traditional: 1 cable = 100 fathoms = 182.88 meters = 600 feet.
- US Traditional: 1 cable = 120 fathoms = 219.456 meters = 720 feet.
Always clarify which definition is intended if precision is critical, though the 1/10 NM version is generally assumed today unless otherwise specified.
How many meters are in a standard cable length?
The internationally recognized standard cable length is exactly 185.2 meters.
How many feet are in a standard cable length?
The internationally recognized standard cable length is approximately 607.61 feet. The traditional British cable was 600 ft, and the traditional US cable was 720 ft.
Is the cable length related to the nautical mile?
Yes, the most common modern definition establishes a direct relationship: 1 cable length = 1/10 nautical mile.
Is the cable length an SI unit?
No, the cable length is not an SI unit. It is a traditional nautical unit derived from maritime practice and later linked to the nautical mile. The corresponding SI unit for length is the meter (m).
Is the cable length still used today?
Yes, while meters and nautical miles are standard for most navigation, the cable length (especially the 1/10 NM definition) is still actively used in specific maritime applications like anchoring, close maneuvering, naval operations, and sometimes in recreational boating contexts. It serves as a convenient subdivision of the nautical mile.
Cable Length Conversion Formulas
To Meter:
To Kilometer:
To Hectometer:
To Decimeter:
To Centimeter:
To Millimeter:
To Inch:
To Foot:
To Yard:
To Mile:
To Nautical Mile:
To Micrometer:
To Nanometer:
To Light Year:
To Astronomical Unit:
To Parsec:
To Angstrom:
To Point (Typography):
To Mil/Thou:
To Fathom:
To Furlong:
To Link (Gunter's):
To Pace:
To Span:
To Digit:
To Ell:
To Finger:
To Roman Mile:
To Stadion:
To Chi (Chinese):
To Shaku (Japanese):
To Li (Chinese):
To Toise:
To Bolt:
To Rope:
To Smoot:
To Sajene:
To Ken:
To Wa:
To Vara:
To Aln:
To Cubit (Royal/Egyptian):
To Versta:
To Arpent:
To Ri (Japanese):
To Klafter:
To Yojana:
To Skein:
Convert Cable Length
Need to convert Cable Length to other length units? Use our conversion tool.
Cable Length Quick Info
Related Length Units
- Meterm
- Kilometerkm
- Hectometerhm
- Decimeterdm
- Centimetercm
- Millimetermm
- Inchin
- Footft
- Yardyd
- Milemi
- Nautical MileNM
- Micrometerμm
- Nanometernm
- Light Yearly
- Astronomical UnitAU
- Parsecpc
- AngstromÅ
- Point (Typography)pt
- Mil/Thoumil
- Fathomfath
- Furlongfur
- Link (Gunter's)li
- Pacepace
- Spanspan
- Digitdigit
- Ellell
- Fingerfinger
- Roman Milem.p.
- Stadionstadion
- Chi (Chinese)chi
- Shaku (Japanese)shaku
- Li (Chinese)li
- Toisetoise
- Boltbolt
- Roperope
- Smootsmoot
- Sajenesajene
- Kenken
- Wawa
- Varavara
- Alnaln
- Cubit (Royal/Egyptian)cubit
- Verstaversta
- Arpentarpent
- Ri (Japanese)ri
- Klafterklafter
- Yojanayojana
- Skeinskein