Rhotheta RT-300 - Page 53

User Manual Bearing System RT-300
Issue: 2017/06/27 [Rev 1.04.c] Page 53 of 79 12-9-1-0013-9-2-0001-3-1-60
After installing the bearing antenna, the compass should be
calibrated. Calibration eliminates environmentally caused
interferences of the magnetic field. Calibration improves
significantly the precision of the compass.
In order to calibrate the compass, the bearing antenna has to be
rotated twice in its vertical axis, the rotational direction doesn´t
matter.
Procedure:
- In submenu SETUP – COMPASS – COMPASS-INT -
CALIBRATION the display appears as shown in Fig. 77.
- Use key 8 <  > to start the calibrating procedure.
- Now the bearing antenna has to be rotated twice (720°) in its vertical axis with an angular
speed as constant as possible.
- Exactly after rotating 720° the calibration process will be completed by pressing key 8
<  >.
Procedure for vessels:
- The vessel navigates with constant speed on a circular track as narrow as possible.
- Start the calibrating procedure at a certain compass course as described above.
- The display is as shown in Fig. 78.
- After ending the second circle (the same course shown in the compass display) the
calibrating will be completed by pressing key 8 <  >.
Procedure for land vehicles:
- The vehicle is driving with constant speed on a circular track as narrow as possible (e.g. in a
roundabout).
- Start the calibrating in a certain position as described above.
- The display is as shown in Fig. 78.
- After ending the second circle the calibrating will be completed by pressing key 8 <  >.
NOTE
The present compass data can be displayed in submenu SERVICE - COMPASS (see
6.2.1.6.4).
Fig. 77
Fig. 78
ATTENTION
After calibrating optimally, the precision of the compass is  2°. If the internal
compass is used as a source for north referring bearings, in the adverse case,
the com
p
ass error can be added the bearin
g
result.
M
e
n
u
SETUP COMPASS INT. COMPASS CALIBRATION