Stabilization function
The ST90 system is provided with a built-in motion sensor to provide electronic stabilization of the sonar beams. It is placed inside the Motor Control Unit. For improved operational accuracy, an external motion reference unit (MRU) can be used. If the sensor is malfunctioning the input can be disabled.
How to open
This function is opened from the Setup menu.
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Description
The Stabilization function allows you to enable or disable the input from the motion sensor.
•  Select On to enable the input.
•  Select Off to disable the input.
If you disable the input from the sensor, the beams will not be compensated for pitch and roll movements.
TipDuring normal operation, always keep Stabilization set to On. This is the default setting. Turning stabilization off may be helpful if you suspect that the sensor provides you with bad data, or if you need to troubleshoot the interface. If you turn stabilization off and this improves the echo presentation you must check your motion sensor.
Details
Roll Offset
To compensate for any sensor misalignment, provide an offset value. Select [] on the left side to decrease the value, or select [+] on the right side to increase.
Pitch Offset
To compensate for any sensor misalignment, provide an offset value. Select [] on the left side to decrease the value, or select [+] on the right side to increase.
Stabilize Heave
This is an "on/off" switch. Use the Stabilize Heave function to control if the sonar beams shall also be heave compensated.
Related functionality
Motion Reference Unit
Use the Motion Reference Unit page to define the data format and the communication port used to import motion information from an external sensor.