
 HISTORY
  UNKNOWN SOURCE--SUBMERGED OBSTRUCTION APPEARED ON CHART 11317 ì
PRIOR TO 1980 EDITION POSITION SCALED FROM INSET OF CHART 11317 ì
(1:20,000) POSITION: LAT 28-37-10N, LONG. 96-37-05W. (ENT 12/87 ì
GM)
  H10411/91-92-- OPR-K228-AHP; OBSTRUCT