Astra A5040 User Manual - Page 10

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4.3 Terminating a bad calibration

If the process is faulty in any way – such as would happen if the manoeuvre cannot be

completed, the process can be terminated by the NMEA command listed and the original

factory default (linear) table is restored. Alternatively this can be done by pressing both

Switches together for at least 1 second.

NOTE that there should be a delay of at least 5 seconds after termination before a new

calibration process is initiated.

4.4 Setting reference NORTH heading

Switch 2 (and also a NMEA command) is provided to set 'zero'. The A5040 should

first be auto-calibrated

then be aligned to North

When the A5040 is fixed in place and connected it can be calibrated as described above.

Choose a calm day and a region of water where there are no currents. Set the boat

turning to left or right at a slow rate and fix the wheel or tiller. Then, when the turning is

steadily under way, press the auto-calibrate button and watch the LED.

When calibration is completed the boat can be on its way and the next task is to set North.

This is best done by identifying transits on a chart and heading the boat on the transit.

Again this should be done in the same conditions so that the heading can be lined up on

the transit and maintained while the set-zero button is pressed.

4.6 Gyro Calibration

There is a factory only command to calibrate the gyro and it is not published