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Autopilot | NSS Installation Manual

¼ Note: You can switch the autopilot to standby mode and take manual control of the boat at

any time during the seatrial by pressing the ‘STBY/AUTO’ key.

The following seatrial calibration should be done:

• Compass calibration; used to automatically compensate for on-board magnetic interference

• Compass oset adjustment, used to compensate for a xed oset in the nal heading

readout

• Wind vane oset to compensate for a wind vane that is not mounted facing in exactly the

same direction as the bow of the vessel (dead ahead)

• Boat speed calibration

• Transition HI/LO speed setting (the speed at which you want to change the set of steering

parameters)

• Automatic tuning of the steering parameters

• Setting the seastate lter

• ‘Saiboat Setup’ menu items

Compass calibration

Before the compass calibration is started, make sure that there is enough open water around

the vessel to make a full turn.

The calibration should be done in calm sea conditions and with minimal wind to obtain good

results. Follow the on-screen instruction, and use about 60-90 seconds to make a full circle.

During the calibration, the compass will measure the magnitude and direction of the local

magnetic eld.

• If the local magnetic eld is stronger than the earth’s magnetic eld (the local eld is reading

more than 100%), the compass calibration will fail

• If the local eld is reading more than 30%, you should look for any interfering magnetic

objects and remove them, or you should move the compass to a dierent location. The

(local) eld angle will guide you to the local interfering magnetic object.

¼ Note: Calibration must be made on the compass that is active for the autopilot. If the com-

pass is not possible to initiate calibration from the device list on the NSS, refer to the compass’

own instructions regarding calibration.

¼ Note: In certain areas and at high latitudes the local magnetic interference becomes more

signicant and heading errors exceeding ±3° may have to be accepted.

Compass mounting oset

After compass calibration, the dierence between the compass lubber line and the boat’s

center line should be compensated for.

Simrad NSS7 User Manual

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