Fathom

The board thread ( from the English: " Fathom ", in German: called "thread", or " fathom " ) is a non- SI -conforming unit of length, which in particular nor in the English shipping - in nautical - for soundings in use is. Originally, it was at the level of the span of the arms of a full-grown man, historically equated six feet.

Occasionally, a newer, non-standard definition is used:

In the EC Directive 80/181/EEC, the first definition is based on, but the numerical value rounded to 1,829 meters.

Prussian thread

The Prussian thread in naval affairs was

Other yarn of seafaring

The Paris line is expected here with 2.2558 mm.

(Sources below )