Hazardous operations 172300Z to 180600Z may in area bound by 13-40.00N 144-37.98E, 13-39.00N 144-33.00E,…

Original warning text

PHILIPPINE SEA.
GUAM.
DNC 12.
1. HAZARDOUS OPERATIONS 172300Z TO 180600Z MAY
   IN AREA BOUND BY
   13-40.00N 144-37.98E, 13-39.00N 144-33.00E,
   13-37.00N 144-30.00E, 13-37.00N 144-27.73E,
   13-27.96N 144-27.73E, 13-27.96N 144-34.00E,
   13-30.00N 144-36.00E, 13-31.00N 144-38.00E.
2. CANCEL THIS MSG 180700Z MAY 23.

Activity windows · 1 in this warning

Parsed from the warning text; outside these windows the area is normally not active, but the warning stays in force until cancelled.