03002, 03101 & 03001 Wind Sentry
C-2
Figure C-2 Declination Angles
– True North to West of Magnetic North
Figure C-3 Magnetic Declination at 2012.5 (degrees relative to true north,
positive is east)
C.3 Setting Up the Wind Direction Sensor on the Basic
Weather Station
Setting up the wind direction sensor for correct orientation is most easily done
with two people – one person to aim and adjust the sensor and a second person to
observe the wind direction readings from the datalogger. Ideally use RS232
Direct Link to laptop computer to view the readings.
Declination angles for True North to the West of
Magnetic North are
subtracted
from 360
,
therefore True North reading is (360
– 15
= ) 345
for this specific case.
MAGNETIC NORTH
COMPASS NEEDLE POINTS TO
MAGNETIC NORTH
TRUE NORTH (map bearing) 15
WEST OF MAGNETIC NORTH
Point the wind direction sensor to
TRUE NORTH (345
) bearing.
