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About these units
Fathom (fath)
A fathom is equal to 6 feet and is historically associated with maritime measurement. Its origins may lie in the approximate span of a fully outstretched human arms, which was convenient for measuring rope lengths by hand aboard ships. Sailors used the fathom to estimate water depth through weighted lines, giving rise to the practice of "sounding" the depths. The fathom became a cornerstone unit in nautical life because it fits the human scale while also being large enough to measure significant underwater distances. Charts, sonar readings, and older depth gauges frequently utilized fathoms, although modern equipment increasingly displays depths in meters. Still, many mariners—particularly in regions using imperial measurements—continue to think instinctively in fathoms when estimating safe anchoring or navigating shallow waters. The unit persists as an important piece of maritime history and remains in active use by traditional sailors, divers, and some fishing industries. Its survival reflects the enduring cultural heritage of nautical practice.
Famn (famn)
The famn, related to the English fathom, was a Scandinavian unit roughly equal to 1.78 meters. Like other fathoms, it originated as the distance between a person's outstretched arms, making it a natural measure for tasks performed at arm's length. Historically, the famn was used in maritime contexts, forestry, and measuring firewood. Sailors relied on it when describing water depth, rope lengths, and the dimensions of boats. On land, stacked firewood was often quantified in famnar, making the unit central to resource management in cold northern regions. Today, the famn has largely disappeared from practical use, but it continues to appear in maritime literature, folklore, and historical accounts. Its surviving references help illuminate the working methods and daily experiences of Nordic sailors, fishermen, and rural communities prior to metrication.