[DG] Axiom 7 with Rv-100 transducer.

[Derek - Raymarine - Moderator]

Hi ystaspinar
Thank you for your enquiry.

I would first like to comment about the suggestion that the "RV only being applicable to Rivers and lakes", this is incorrect, the RV being widely used globally inshore and offshore.
You make the point that you are using the RV as “sea at aproximately 250 feet (75 meters) depth” - this is possibly reaching the limit of the 3D SONAR. Read this here for typicalperformance of sonar types.

Additionally there may be other factors in the sea area that is limiting the SONAR's functionality, such as water clarity, the type of seabed, aeration, coatings applied to the transducer face, water salinity, temperature and thermoclines. The link found here refers to dragonfly transducers, but many of the points hold true for RV transducers too.

Using the “High CHIRP” element should deliver a better depth range, have you tried this option?

Another option could be to fit something like a P66 transducer as well as the RV transducer, and then use a Y-Cable to join them. Then you’ll have the AIRMAR 50kHz/200kHz, and DownVision and RV3D to play with. (The y-cable will make the “high CHIRP” element redundant though)

Does the RV SONAR works well when stationary, but not at depth (this could then be a noise/aeration issue with the transducer), or do you get bad performance all the time?

The Jigging Question could well be position of the transducer, angle and possible aeration. The RV transducer and the Dragonfly Transducer practically have the same DV and High CHIRP elements, so should show the same info.

With regards to the question about the Rock – the rock will appear when the Transducer starts to go over it – not when the front of the hull goes over the rock. It is not a forward looking transducer. The beam width of the High CHIRP is about 25 degrees

Your “third question” regarding angle -this kind of relates to the vessel,, but the handbook suggests:





Thanks