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 previously. The Gemini NBI’s 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.

Operating at 620kHz the Gemini NBI is able to produce images with 10mm range resolution while the 0.5° horizontal angular resolution results in an extremely sharp sonar image. Where monitoring your position relative to a known target is the objective, and not general obstacle avoidance, then the Gemini NBI can help guide you safely to the desired target.

The multibeam transducer design used for the Gemini NBI results in a 130° sector scan width and advanced technology allows update rates as high as 30 scans per second. With wide angle imaging and a high refresh rate the user is able to quickly and effectively manoeuvre to a target in poor visibility conditions Gemini NBI can be supplied with either Ethernet or VDSL communication allowing the system  to interface to deep water systems with multiplexers as well as shallow water systems where there may  only be a copper shielded twisted pair (STP) available. The Gemini NBI software can be run on the Tritech Surface Control Unit (SCU) or  installed on the customers own laptop PC.