The Gemini NBI offers a narrow vertical
beam and 130° swathe.

The Gemini NBI produces an acoustic image,
cutting through the water with a narrow acoustic
beam and at the high refresh rate offered from
the Gemini range of multibeam sonars. Based
on the proven design of the Gemini 720i, the
Gemini NBI uses a 1° vertical beam instead of
the 20° vertical beam found on the 720i. This
reduced beam width allows the user to more
precisely identify the position of the acoustic
targets than is possible with a wide beam
imaging sonar which is commonly used for
obstacle avoidance operations.