New Dragonfly 4pro - No depth reading at more than 10mph

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum jplowing,

The problem reported whereby bottom is being lost above 15 MPH is quite likely resulting from aeration of the transducer. Low power / high sensitivity transducers such as the Dragonfly transducers require a non-aerated flow of water across the face of the transducer. The photo below shows a hull being subjected to such aeration:



As indicated here, dropping the trailing end of the transducer a notch or two will generally address such problems should the transducer be properly installed. Further improvements to bottom tracking and addressing the other depth related issues which you have reported were included within the Dragonfly v12.08/v12.09 software update. It is accordingly recommended that the software within your Dragonfly display be updated accordingly should you not already have done so.

Should the bottom tracking problems persist after addressing the items suggested above, then it would be recommended that you respond accordingly and attach some photos clearly showing the following:
1) from the rear ... entire transom of the hull
2) from the rear ... the side of the hull where the transducer has been installed
3) from the rear directly behind and slightly below the transducer ... the transducer's position relative to the bottom of the hull and showing the bottom of the hull forward of the transducer
4) from the starboard side of the transom at the same height as the transducer ... viewing toward the transducer