variants:
or less commonly fathom curve
Definition of fathom line
: a usually sinuous line on a nautical chart joining all points having the same depth of water and thereby indicating the contour of the ocean floor
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“Fathom line.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/fathom%20line. Accessed 10 Apr. 2021.
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