La Crosse Technology A92239 Manual Del Usuario página 43

12.4 Compass Mode - Magnetic Declination Compensation
magnetic
true north
declination
magnetic
north
obj ect B
magnetic
bearing
323°
True Bearing (T B) =
Magnetic Bearing (MB) - Westerly Magnetic Declination (W)
300° (T B) = 323° (MB) - 23° (W)
Co m p en sate th e Bearin g
with Westerly (W) Mag n etic Declin atio n
true north
object B
magnetic
bearing
278°
True Bearing (T B) =
Magnetic Bearing (MB) + Easterly Magnetic Declination (E)
300° (T B) = 278° (MB) - 22° (E)
Co m p en sate th e Bearin g
with Easterly (E) Mag n etic Declin atio n
12.5 Calibrating Mode - Calibration the Compass
Normal
Compass Display
Magnetic Declination Compensation
true
● To compensate for an object's bearing, either subtract
bearing
300°
● Example 1: Westerly magnetic declination 23°and the
point A
● Example 2:
magnetic
declination
magnetic
north
● The Station allows you to compensate the compass
true
bearing
300°
● Check the coming section "Calibrating the Compass" for
point A
When to Calibrate the Compass
● The Station has to employ a compass calibration in one of
the following conditions:
1) The Station is going to be used for the first time,
2) The battery is replaced,
3) The bearing direction digits are flashing (distortion
occurs).
4) The compass is used in a location which is apart from the
place where the compass has been calibrated,
5) The user intends to manitain the precision of the digital
compass.
How to Calibrate the Compass
● The compass calibration includes two different processes:
Rotation Calibration and Magnetic Declination Setting.
● It is recommended to conduct both calibrations from time to
time to achieve a more accurate reading.
IMPORTANT:
If the compass has not been calibrated, the direction made by
the compass may be inaccurate.
32
westerly (W) magnetic declination or add easterly(E)
magnetic declination with the magnetic bearing.
compass needle points 323°.
● TB = MB - W. When MB = 323° ; W =23°
magnetic
● TB = 323° - 23°
● TB = 300°
● The true bearing is 300°.
Easterly magnetic declination 22° and
the compass needle points 278°.
● TB = MB + E. When MB = 278°; E = 22°
● TB = 278°+ 22°
● TB = 300°
● The true bearing is 300°.
bearing at a place where the magnetic declination is
either Westerly declined or Easterly declined.
more details on the setting.
bearing