Convert from fathom to gigaparsec

Unit Definition (fathom)
a linear unit of measurement (equal to 6 feet) for water depth.

Unit Definition (gigaparsec)
The Gigaparsec is a non-metric unit of distance equal to one billion parsecs, 3.2616 billion light years, or 30.856 78 zettameters (30.856 78 x 1021 kilometers). The unit is used in astronomy.