Raymarine’s RealVision “is a very similar concept from what we’ve done with down and side imaging,” says Adam Murphy, global product manager for sonar and radar. “The only thing we had to do was add a separate set of receivers to the side imaging, which allows you to calculate angular distances on returns.”
RealVision’s transducer employs “just under 10” elements, Murphy says, hedging. Specific elements send, and others receive.
The transducer chirps around the 350 kHz frequency range. “We pick elements that are a little more expensive but have a 60 kHz sweep inside those elements. That’s what gets us extra resolution,” Murphy says.
Raymarine uses interferometry rather than beam steering or forming. With RealVision, the boat must be moving. The beam can pick up targets and determine their angular position up to 300 feet away.
Raymarine transducers also have an attitude and heading reference system (AHRS), which takes into account the heading, motion and roll of the boat to draw a clearer picture. RealVision is built into Axiom and Axiom Pro units; the entry price is $1,249 (Axiom 7RV and RealVision transducer).