[vi-jee-uh; Sp. bee-hee-ah] 
[-jee-uh
z; Sp. -hee-ahs] . | a navigational hazard whose existence or position is uncertain. |
| vi·gi·a (vĭ-jē'ə, -hē'-) n. A warning on a navigational chart indicating a possible rock, shoal, or other hazard, the exact position of which is unknown. [Spanish vigía, from Portuguese vigia, from vigiar, to look out, from Latin vigilāre; see vigilante.] |