Sound Velocity Indicator; Palette Selector; Gain Assist; Gain Control - Gemini 720i Product Manual

Gemini Software Operation

5.1.12. Sound Velocity Indicator

The sound velocity indicator at the upper right hand side of the display shows the sound
velocity used by the Gemini Sonar whilst producing the sonar image. The Gemini Sonar can
use a fixed value for the sound velocity or an automatically measured velocity.

5.1.13. Palette Selector

The Gemini software is supplied with a number of palettes which are used to show the
different intensities in the sonar image in different colours. The palette bar on the left hand
side of the screen shows the mapping currently being used.
Clicking on the palette bar opens a palette selector which allows the selection of the palette
to use. As the mouse is hovered over the different palettes, the sonar image will preview
that palette.

5.1.14. Gain Assist

By default this is turned on as indicated by green text. When turned on the Gemini will
automatically reduce a high gain setting on range lines where bright targets are observed.
This improves the clarity of the target, but can give the effect of dark bands in the background
image. When turned off the Gemini will always use the gain slider setting. If bright targets are
observed and a high gain setting is used, the target will appear to spread out in the displayed
image.

5.1.15. Gain Control

Document: 0685-SOM-00001, Issue: 11
Note
The Gain Assist setting can be changed during operating the Gemini live and
when replaying logged data but cannot be changed for log files created with
software versions prior to 1.16.0 for which it will always be turned ON.
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Gemini Imaging Sonar
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