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vigia

vigia
  (ˈvɪdʒɪə)
  [Sp. or Pg. vigia a look-out, etc.:—L. vigilia (see next). Hence also F. vigie.]
  A warning on a sea chart to denote some hidden danger.

1867 Smyth Sailor's Word-bk., Vigia, a hydrographical warning on a chart to denote that the pinnacle of a rock, or a shoal, may exist thereabout. 1875 Bedford Sailor's Pocket Bk. v. (ed. 2) 147 Vigias.—Numerous imaginary dangers are traditionally inserted in all Ocean Charts. 1899 M. Roberts in Brit. Soldiers (1900) 228 ‘There's a vigia marked on the chart for hereabouts,’ said Captain Spiller.

Oxford English Dictionary

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