10.4.3 User Manual Contents April 17, 2020
Firmware: 5.2.1 Page 24 of 142
2.5
Sensor Mounting
WBMS Sonar Head
The sonar must be mounted with the transmitter (projector) pointing aft, so that the receiver is
measuring in the quietest, least turbulent water for best SNR. Mount the sonar in-line with the keel
or centerline of the survey platform and parallel to the water surface to within about 0.5°. Higher
misalignment and offsets between sensors will translate to a higher error in sounding position.
Consequently, it is best to mount all sensors (sonar, IMU, GNSS antennas) as close together as
possible.
It is best practice to feed the sonar cable through the mounting pole to protect against vibration or
flotsam collision during surveys. The sonar cables should never be connected or disconnected
underwater. Ensure connectors are always clean and dry. Screw on the protective caps on sonar
wet-end, cables and SIU when system is stored.
The bolts that secure the sonar to the pole/bracket should be 30-35mm longer than the thickness of
the mounting bracket and made of high-quality stainless steel to prevent corrosion especially in
saltwater environments. Use a lock washer and/or an anaerobic thread adhesive such as Loctite
242 Blue to prevent loosening of sonar during long deployments.
It is also possible to permanently hull mount the sonar. For more information refer to section 2.5.4.
CAUTION: Electrically Isolate WBMS from Metal Boat
If using a custom-built WBMS mount that is not provided by NORBIT, please
use a non-conductive plate to electrically isolate the sonar. This will help
prevent corrosion.
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