Celestron 48001 TrekGuide Instruction Manual page 5

Note: The compass must be kept in a level position
when in use. Taking a measurement while the unit is not
horizontal (in relation to the horizon) can result in a large
measurement error.
d M
irecTion eaninG
N North
E East
S South
W West
c S c
oMpaSS enSor alibraTion
The compass should be calibrated before use OR when the
batteries are replaced.
• In COMPASS mode hold the "C" button for 3 seconds to
enter the compass sensor calibration mode, and press the
"C" button to start the calibration.
• Keep the unit in a level position or on top of a non-metallic
table/desk. Reference the arrow showing in the LCD, rotate
the compass clockwise for one full rotation slowly:
• When finished, the LCD will display "OK" if the calibration is
successful or display"Fail" if it failed as:
c
oMpaSS
d M
irecTion eaninG
North-
NNE
Northeast
East-
ESE
Southeast
South-
SSW
Southwest
West-
WNW
Northwest
→ →
Always take bearings in the open air, because it is easily
affected by disturbing sources of magnetism.
b l
earinG eGend
d M
irecTion eaninG
NE Northeast
SE Southeast
SW Southwest
NW Northwest
S M
eT The aGneTic
The angle between magnetic north and the true north direction
is called magnetic declination. The earth's magnetic poles
fluctuate over time, and it also varies from place to place. Find
the magnetic declination on a map or website, and then set
the declination on this unit to offset the difference between
magnetic north and true north. Please note that if you fail to do
this, the readings you get from the compass could be in error.
• In COMPASS mode, hold the "C" button for 3 seconds to
enter the compass sensor calibration mode, press "MODE"
button to enter setting of the declination angle. The angle
will flash on the LCD. For example, below the " 0° " will flash
on the LCD).
• Press "▼"or "▲"to change the angle value, range from
-90°to 90°, and press "MODE" button to confirm and exit
the setting.
4
d
irecTion
ENE
SSE
WSW
NNW
d a
eclinaTion nGle
M
eaninG
East-
Northeast
South-
Southeast
West-
Southwest
North-
Northwest