Nesis
— User’s Manual
6.5
Compass Calibration
importance to install Magu away from ferrous materials (like engine or steel rods) and away
from electromagnetic devices (like speakers, radio transmitter, transponder, etc.)
Since electromagnetic devices emit their magnetic field only when they are turned on, you
must turn on all electric devices before you start the compass calibration and keep them
activated for the time of calibration. You should also make your airplane as level as possible.
The calibration is done in two steps. Both steps are briefly explained first. Later, more
detailed step by step procedure is given.
The first step requires turning the airplane for a little bit more than one full circle, about
400
◦
. This step efficiently removes a large portion of the nonlinear error. However, some
error, which is more or less constant in all directions, remains. This is called the offset
error.
In the second step, this remaining offset error is entered manually. In order to obtain
the offset error, airplane shall be directed into two or three known reference headings
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.
Write down the differences between the reference heading and Nesis heading shown on
the HSI map. Average value of the differences, gives the final offset, which should be
entered into Nesis. Note that the second step can be done much later (a few days or
weeks) than the first step.
Figure 32 shows compass calibration dialog.
6.5.1
First Step
Here are the instructions needed to perform the first step of the calibration. Please, be sure
that you will be able to turn the airplane for more than one full circle in a position, which is
as close to the level flight as possible.
Figure 32:
Compass calibration dialog - first step is in the progress.
1. Open the Compass Calibration dialog and enter the password.
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Be careful. When the reference headings are magnetic headings, Nesis HSI map must be set to
Magnetic
up
and when the reference headings are true headings, Nesis HSI map must be set to
Heading up
.
Version 2.0
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©
Kanardia
2011