© 2023 Radiodetection Ltd 30
5.10 Magnetic Heading
MAGNETIC HEADING
The 8200SG has an integrated magnetic compass that
provides a value for heading, which is used to calculate
the most accurate GNSS position of the buried utility.
The magnetic heading information (‘MAG_H’) can be
found in the ‘INFO’ section of the menu. The sub-
sections of the MAG_H menu are described below:-
ON – turns on the magnetic heading
compensation for the GNSS position (default
state)
OFF – turns off the magnetic heading
compensation for the GNSS position
CHECK – displays the current heading value
under the bar graph (figure 8). This is useful to
compare heading accuracy with another
physical or digital device. The error is also
shown in the bottom right (figure 8).
RESET – selecting reset and then ‘YES’ will
reset the calibration of the magnetic compass.
Over time the accuracy may degrade, or
environmental/location factors may impact the
accuracy and require a re-calibration. Once
selected, the user will need to slowly spin the
locator in a circle whilst 50 reference points are
taken. Whilst this process is occurring the
number of points taken is displayed in the
bottom right of the display (figure 7a and 7b)
EXIT – exits from this part of the
5.11 Magnetic Heading
Calibration
1. In the RD8200SG settings, navigate to: INFO >
MAG_H > RESET > YES
2. Then press the button 4 times to return to the
main screen. The RD8200SG will now be in
Magnetic Compass RESET mode. (Reset mode
means the magnetic compass calibration process
has begun).
3. Slowly rotate the locator through 360 degrees whilst
maintaining a vertical orientation, using the spirit
level bubble (within 5 deg from vertical). You will see
the two highlighted numbers in figure 7a and 7b
increase together as more valid calibration
measurements are taken. These two numbers will
always be the same in RESET mode. Keep rotating
until the numbers reach at least 50 valid
measurements.
4. Once 50 valid measurements are obtained, the
RD8200SG will automatically switch into the CHECK
mode. The purpose of check mode is to evaluate
calibration quality. In this mode the two highlighted
numbers (figure 8) will be different – the top number
represents magnetic heading (like a conventional
compass with north being 0 degrees) and the bottom
number represents the calibration percentage error.
5. Check mode can be accessed at any time, without
having to complete RESET mode, through:
INFO > MAG_H > CHECK then press the button
3 times.
6. For a successful calibration, the calibration
percentage error (bottom highlighted number in
figure 8) must be less than 5%.
7. To exit the magnetic calibration, go to INFO >
MAG_H > EXIT then press the button 3 times to
go back to the main locator operation screen.
Note: If the top circled number reads 360 in
either mode, this represents an error.
Figure 7a Figure 7b
Figure 8
North
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