Gemini 720i Product Manual page 52

Gemini Software Operation
In this case, sonar 1 is looking forward while 2 and 3 are looking aft. There is no overlap and
each sonar is displaying a full 120° arc.
Overlapping sonars is also possible and any images generated will be a combination of
echoes from both heads:
Document: 0685-SOM-00001, Issue: 11
Note
Turning off the range lines and text can improve the display.
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Gemini Imaging Sonar
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