Navig.
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.
Navig.
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.
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012