
 HISTORY
  UNKNOWN SOURCE--SUBMERGED OBSTRUCTION FIRST APPEARED ON 1970 ì
EDITION OF CHART 11317 (522). POSITION SCALED FROM INSET OF CHART ì
11317 (1:20,000) POSITION: LAT. 28-37-43N, LONG. 96-33-14W. (ENT. ì
12/87 GM)
  H10390/91-- OPR-K228-AHP; AD