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clearing mark

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noun Navigation.
  1. either of a pair of landmarks or marks on a mariner's chart lying upon a line (clearing line) along which a vessel can sail to avoid navigational hazards.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for clearing-line

Historical Examples

  • The clearing-line is made of several yards of strong small cord, to the end of which is fastened a heavy ring of lead or brass.

    Every Boy's Book: A Complete Encyclopdia of Sports and Amusements

    Various