System Configuration dialog box - Master Reference page
On the Master Reference page, you can assign any external sensors you have set up as the primary source for various types of navigational data.
How to open
This dialog box is opened from the Setup menu.
Select the DeploymentMaster Reference tab.
Image
Description
When using the M3 Sonar for imaging, set up sensors for Position and Heading if you want to create GeoTiff files or create a real-time mosaic.
When using the M3 Sonar for Bathymetry or Profiling, set up sensors for Position, Heading, Pitch/Roll, and Heave as a minimum.
If no sensor input is required for a particular reference, you may leave the value set to Fixed. For example, if the Sonar Head is mounted on a tripod with a known position, heading, and pitch/roll, these references will have fixed values. Also, sensor input may not be required for the M3 software if the sensors have been set up in third-party software. When setting a value to Fixed, you can enter the fixed value into the adjacent text box.
Details
Configuration
Select the desired configuration from the drop-down list. Click New to create a new configuration based on the default settings. Click Save As to save the current configuration or Delete to delete the current configuration.
Master Reference
•  Position
A location derived from measuring external reference points.
•  Depth
The vertical distance downwards from the water surface.
•  Heading
The direction in which a vessel is pointing, as opposed to the course made good.
•  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.
•  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.
•  Heave
Heave is the linear vertical (up/down) motion of the vessel.
•  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.
•  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.