Emsis — Manual
5.4
Emsis Setup Screen
full. You have to make more than a full circle because the initial
readings are not used in computation.
At this point a blue ellipse is drawn on the chart. Corrections up to
15 degrees are generally accepted as appropriate. If you constantly
get correction curve larger than 15-20 degrees, then you probably
need to find a better location for Magu. The correction in Figure 23
reaches ca. 8 degrees.
Important: If you are happy with the results, you must close the
window using the
OK
button. This will also save the results. Closing
with the
close
button does not save the results.
Compass Offset
The procedure mentioned above removes most
of the compass error and in most cases this is more than enough.
However, some constant error in all direction remains. You need to
obtain this error by observing difference between known reference
magnetic headings and by the headings shown on the window. This
error is more or less constant regardless to the direction. Write down
this difference for a few different directions and calculate the average.
Enter this final correction using the
Compass Offset
option. When
the compass readings were too large, enter negative value and vice
versa.
Figure 24:
Compass offset window - final adjustment of compass
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Kanardia
2021