February 2020 – TD 266 OPERATING MANUAL – ZPulse® DCS 4420/4830/4520/4930 Page 43
2.6.7 Dependencies
Figure 2-30: Dependencies
Enable Magnetic Declination is normally used when sensor is used close to South Pole or North Pole. Declination
Angle (Deg.M) is a value to correct for the magnetic variation on the site where the sensor is used. This is the angle in
degrees between magnetic north and true north.
Magnetic declination (variation) is the angle between the magnetic
north and the true north. This angle varies depending on the position on the Earth’s surface and also varies over time.
Declination is positive when magnetic north is east of true north and negative when it is to the west (input angle value
±180°). Magnetic declination at the deployment location can be found for i.e. on NOAA website:
http://www.ngdc.noaa.gov/geomag-web/
2.6.8 SGII and SmG Features
Figure 2-31: SGII and SmG Features
Enable Sensor Parameter Input If enabled the sensor might use heading data from other sensors via SeaGuardII or
SmartGuard. E.g. if a Airmar compass is connected to the same logger but placed in away from any magnetism that
disturb the internal compass, data from this sensor can be used by the sensor in calculations. Only to be used in AiCaP
mode and needs to be disabled if used with SeaGuard.
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