Avoidance sonars available for underwater vehiclesDolphin 6201 and 6001 obstacle avoidance sonars are available for underwater vehicles.The 3,000 m depth-rated 6201 was developed specifically for autonomous survey vehicle pilotage and navigation. It fits into the nose cone of the vehicle and has a dual beamwidth sonar transmitter coupled with a multielement receiver and forward looking altimeter. This enab!es the instrument to perform not only obstacle avoidance but also to act in inverse mode automatically to track to a target such as a wellhead.In obstacle avoidance mode, the 6201 scans continuously over a 90° sector as far as 200 m ahead while simultaneously identifying as many as...

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