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NORTEK
8.2.5 Over the Side Mounting
Movable mounts are used for short term surveys or when the Signature sensor will be moved from ship to
ship. Most of these mounting arrangements are designed so the Signature sensor will be mounted over the
side. It is important that the mount is rigid so that the orientation of the Signature sensor does not change
over the course of the survey.
Note that the relative orientation of the Signature sensor as referenced to the GNSS coordinate system
should remain unchanged over the survey. Mounting systems that uses a separate, towed catamaran or
other towed body are not suitable unless the GNSS antenna is also mounted on the towed body.
The instrument may be supplied with an over the side mounting frame. This stainless-steel frame is basically
a container for the Signature instrument that protects it against damage from impact and to ease the water-
flow around it. Using the drop-shaped cover will also significantly reduce the drag on the instrument when it
moves through the water.
For maximum flexibility, the top of the container has 8 slots that fit M12 bolts. It is up to the user to provide a
mounting structure with a mating flange. The example shows a standard flange, model EN 1092-1.
