An adjustable, grease-filled, dampening cylinder cancels out shipboard
vibrations and the pitch and roll of the ship.
Every 4 days at 1200 UTC, and on the first day of the month. Time should be set to
Seven to eight pulls.
Time adjustments are required when the time is in error by 15 minutes or more,
and pressure adjustments are required when the pressure is off by 1.5 hPa or more.
The AN/UMQ-5 wind-measuring set, the Type B-3 wind-measuring system, and
the AN/PMQ-3 hand-held anemometer.
At 0000 UTC on the first day of each month and at intermediate times to prevent
loss of data.
At the beginning and ending of each chart roll, near the time of each synoptic hour,
when notified of an aircraft mishap, for each disruption in the trace, and at the first
observation of the day when the station does not operate 24 hours a day.
Observe the sea height and direction.
The true wind will be less than the apparent wind.
Obtain the ships course and speed, and then proceed to an unobstructed area of
the ship near the windward side. Align the sights with the true-wind reference or
the bow of the ship parallel to the centerline.
Only when the wind speed is lower than 15 knots.
The ML-217 rain gauge.
It measures the transmissivity of light through air to determine visibility.
The term "sector visibility" with respect to the AN/GMQ-32 indicates how far an
unlighted object can be seen during the day. Runway visual range is how far
runway lights can be seen by a pilot.
Transmissivity values are presented on the AN/GMQ-32 in terms of percentages
and converted to reportable values (i.e., statute miles) using tables in