System Configuration dialog box - Mounting Offsets page
The mounting offsets are required to calibrate the position of the Sonar Head relative to the GPS antenna. If you have a rotator, you must calibrate the position of the rotator relative to the Sonar Head.
How to open
This dialog box is opened from the Setup menu.
Select the DeploymentMounting Offsets tab.
Note
This page is not available while the Sonar Head is running.
Image
Description
If you are mounting your M3 Sonar Head (on a Pole Mount for example), you will need to specify where the Sonar Head is positioned in three-dimensional space relative to the GPS antenna.
Inaccurate mounting offsets will display your sonar data incorrectly in the 3D Point Cloud and sonar view.
Tip
If you have recorded your sonar data using the wrong offsets, you can still fix the offsets using this dialog box. Check the Override Mounting Parameters box to apply the correct mounting offsets to your recording.
Details
Mounting
•  X Offset
X is defined as the Sonar Head relative to the GPS antenna across track. Port is negative and Starboard is positive.
•  Y Offset
Y is defined as the Sonar Head relative to the GPS antenna along track. Aft is negative and Fore is positive.
•  Z Offset
Z is defined as the Sonar Head relative to the GPS antenna’s vertical distance. Down is negative and Up is positive.
•  Orientation
This drop-down list allows you to select a number of pre-configured Sonar Head orientations. Observe the animation to make sure your Sonar Head is facing in the correct direction for the selected orientation. The orientation depends on how you are using the M3 Sonar. For example, a forward-facing orientation can be used for obstacle avoidance on a remotely operated vehicle (ROV). A downward-facing orientation can be used for bathymetric surveying. An orientation that rolls sideways can be used to scan vertical structures. An upward-facing orientation can be used for scientific research, such as gas-seep monitoring. If you wish to create your own orientation, select Custom, then enter in the precise pitch, roll, and yaw angles of the Sonar Head position.
Tip
If images appear on the wrong side of the sonar view (for example, objects on the right appear on the left), then select one of the “Inverted” orientations.
Rotators
Select the rotator you wish to configure from the Rotators list. You can see which axis has been assigned to each rotator.
•  Radius
The radius offset is necessary if your Sonar Head is attached to the rotator with an arm. The length of the arm can be entered as the radius.
•  Angle
Entering an angle is not necessary if the transducer face of the Sonar Head is aligned with the rotator. However, if the Sonar Head is installed at an angle to the rotator, then enter that value here.
Override Mounting Parameters
Enabling this option will apply the current offsets on this page during playback instead of the offsets recorded in your data file. The offset override affects what you see during playback in the 3D Point Cloud, not the sonar view.
Tip
If you apply the offset override, playback a file, then re-record a new file during playback, the offsets will not be applied to the new re-recorded file (the new file will use the original offsets). However, if you export data to a third-party application in playback mode, the offset override will be applied to the exported data.