Calibrating The Digital Compass - Bresser GPS 7x50 Mode D'emploi

USING THE RETICLE (15)
A reticle is incorporated in the left eye piece of the GPS Binoculars. This reticle is used to measure
the distance and size of an object. Binoculars have vertical and horizontal scales graduated every
5 mils. Those scales use a unit called mil. 1 mil equals the angle in which a 1 m object is seen at a
distance of 1000 m away from your position.
• How to measure distance
(If the object size is known)
object size (m)
Distance (m) =
scale reading (mil)
Example:
Object Length is 10 m, scale reading is 20 mil
10
x 1000
20

CALIBRATING THE DIGITAL COMPASS

A digital compass is incorporated within the corpus of the left eye to indicate the direction in
numerical values. Directions will be displayed in degrees clockwise with the north at 0°. (Example:
The east is at 90° and the south is at 180°).
• Because the digital compass measures the geomagnetic fi eld using a geomagnetic fi eld sensor
(2-axial Terrestrial magnetism sensor). It cannot measure directions inside a building, near a
strong magnetic fi eld, inside a metal case, etc. This product displays the azimuth value on the
internal liquid crystal display based on the signals of this geomagnetic fi eld sensor.
North
West
South
Calibration means adjusting the output of the geomagnetic fi eld sensor. Calibration needs to be
conducted in such cases as when you will use the binoculars for the fi rst time, when you will use
if after a long time, when you sense a periodic error in the azimuth, or when you frequently fi nd
"ERR" (error)" indicated on the internal liquid crystal screen.
1. Press the [POWER] button (12) for approximately 1 second to switch on.
2. Calibration should be performed by placing the GPS Binoculars on a horizontal table or a
x 1000
= 500 m (distance)
East
• How to measure an object size
(If the distance to the object is known)
Object size (m) =
Example:
Distance is 500 m, scale reading is 20 mil
500 x 20
= 10 m (object size)
1000
Horizontal stand
- 16 -
distance (m) x scale reading (mil)
1000