|Unit name||Nautical thread|
|Physical quantity (s)||length|
|system||Anglo-American system of measurement|
|In SI units|
|See also: cable length|
The board thread (from the English "fathom", to German: "thread", and " fathom called") is a non- SI -compliant unit of length which especially in the English-language navigation - in the nautical - for depth indications in use is. Originally, the measure was the span of the arms of a full-grown man, historically equated to six feet, the fathom.
- 1 statute mile = 880 fm
Occasionally a newer, non-standardized definition is used:
In the EC Directive 80/181 / EEC, the first definition is based on, but rounded the numerical value to 1,829 meters.
Different definition of thread in seafaring
The Paris line is calculated here with 2.2558 mm.
|Prussian thread||1 thread||= 6 feet (Prussian) = 1/2 rod||736.2||1.88312 meters|
|Danish thread||1 favo||= 6 feet||834.7||1.88291626|
|French thread||1 bream||= 5 feet||720||1.624176|
|Hamburger thread||1 HF||= 6 feet||762||1.7189196|
|Dutch thread||1 Vaam||= 6 feet||834.8||1.88314184|
|Neapolitan thread||1 NF||= 5 feet||720||1.624176|
|Portuguese thread||1 Braca||= 8 palmos||775.2||1.74869616|
|Swedish thread||1 SF||= 6 feet||789.6||1.781968|
- Erna Padelt, Hansgeorg Laporte: Units and magnitudes of the natural sciences. Fachbuchverlag Leipzig 1967, p. 153
- Wolfgang Trapp : Small manual of the dimensions, numbers, weights and the time calculation. With tables and figures . Philipp Reclam jun., Stuttgart 1992, p. 131 f. (= Universal Library No. 8737) ISBN 3-15-008737-6 .