• | Position A location derived from measuring external reference points.
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• | Depth The vertical distance downwards from the water surface.
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• | Heading The direction in which a vessel is pointing, as opposed to the course made good.
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• | Magnetic Variation If you are using a magnetic heading sensor, enter the local magnetic variation into the Magnetic Variation box to get true heading. This parameter can be changed while the Sonar Head is running.
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• | Pitch/Roll Pitch is the up/down rotation of a vessel about its lateral axis. Roll is the tilting rotation of a vessel about its longitudinal
axis.
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• | Heave Heave is the linear vertical (up/down) motion of the vessel.
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• | Sound Speed A sound speed sensor is required to accurately measure in-water speed near the Sonar Head. This parameter can be changed while the Sonar Head is running.
Note
Select IntegratedSVS only if you are using a Sonar Head with an integrated sound speed sensor.
Check the Override Sound Speed box if you want to replace the sound speed value in your recording with a fixed value during playback. This may be necessary,
for example, if your recorded sound speed is not accurate. You can override the sound speed in .mmb files only.
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• | Altitude Altitude is the vertical distance from the sensor to the seafloor. If you need the depth below the transducer, use the NMEA DBT datagram.
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