MGL Avionics AV-2 Operating Manual page 6

AV-2 Operating Manual
Each ">" or "<" equals 2 degrees of heading error. To cancel the course steering function, simply press the F1 key again.
3.3.7 The reverse course (from heading) display
Heading stability issues
You may find short term fluctuations of the heading occurring. These tend to be very small and are typically less than one
degree. This could still cause the heading to fluctuate occasionally by a single degree. These fluctuations occur naturally
in the earth's magnetic field and can also be caused by nearby electrical equipment such as radios, lamps, electronic
instrumentation or computers, even the ignition systems of engines. The AV-2 is specifically designed for fast response
and thus may show residual fluctuations of the magnetic field that are impossible to filter out without causing delays in the
update of the heading information. Each measurement interval of 0.5 seconds consists of a computational evaluation of
12.000 individual measurements of the magnetic field at the magnetometer sensors.
3.4 Sensor communication error
Should the AV-2 lose communication with the SP-X instrument for the duration of 5 seconds or more, the AV-2 will display
the following message:
The current heading is 77 degrees; course steering indicators show the need to steer
slightly to the right to intercept the course.
The current heading is 28 degrees; course steering indicators show that a large
correction to the right is required to intercept the course.
Press the F2 key to activate the reverse course display. This display remains active for
about 4 seconds before reverting back to the normal heading display.
Page 6