Nesis
— User’s Manual
6.6
Time & Date
2. Press the
Record
button and turn the airplane for more than one full circle. Try to
keep constant angular rate when turning. The recording stops automatically, when
thick green line makes full circle on the Nesis screen.
3. Observe the
new calibration line
. In most situations, this line should be within the red
dotted line interval. The calibration line shows magnetic compass correction calculated
at given heading. These corrections can reach up to +/- 20
◦
and in rare cases even
more.
4. If you are happy with the results, press the
Save
button to keep new calibration.
Otherwise, press
Reset
button and go to step 2.
5. Press
Close
in order to complete the step one. This closes the calibration dialog.
6.5.2
Second Step
Here we assume that the first step was completed successfully. Now, a constant offset error
remains. You need to obtain this error by observing difference between known reference
headings and by the headings shown on the HSI map. This error is more or less constant
regardless to the direction. You can calculate the difference comparing true headings or by
comparing magnetic headings, but do not mix them. You should never calculate difference
between magnetic heading reference and true heading HSI map reading or vice versa.
Write down this difference for a few different directions and calculate the average. Set this
average into Nesis.
1. Open the Compass Calibration dialog and enter the password.
2. Press the
Offset
button and enter the offset.
3. Press
OK
to close the offset dialog.
4. Press
Save
to save new offset into magnetic compass.
5. Close the calibration dialog using
Close
.
This completes the magnetic compass calibration.
6.6
Time & Date
Nesis internal clock requires correct UTC
20
time. When Nesis internal time does not match
the UTC time, internal time is synchronized with the help of dialog shown on figure 33.
Press the
Use GPS
button to synchronize Nesis time with the GPS time. Please note that
this command works only when the airplane is not flying and engine is not running
21
.
The same dialog is used to set the time zone – used for local time. A time difference between
local time and the UTC time must be set. Some countries (India and Iran, for example) do
not round the time difference to whole hour, but to 30 minutes. Some areas in Australia even
use 15 minutes local time intervals.
20
UTC – Coordinated Universal Time. Visit
en.wikipedia.org/wiki/UTC_time
for more details.
21
The reason for this limitation has ground in the logbook recording. Logbook is started as soon as engine
starts or flight is detected. Thus a time change corrupts logbook records.
Version 2.0
40
©
Kanardia
2011
