
 SURVEY REQUIREMENT COMMENTS
  IF NOT VISIBLE, A 100 METER SWATH SEARCH IS REQUIRED ON THE ì
AXIS OF EACH ROW OF MARKERS.

 HISTORY
  CL293/68--TWO SETS OF MARKERS(4) ABOUT 250 METERS APART THAT ì
MARK A DREDGED CHANNEL (REF. AWOIS ITEM 05398) REPO