[CA] [CA11] Troubleshooting i40 Depth Instrument

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum John,

The reported issue is occurring because the i40 Depth & Bidata instruments are not designed for use within in-hull depth transducers. As much as twenty percent of of the energy from a transducer's ping lost when a transducer pings through a hull. Unlike the i50 Depth and Tridata instruments and the iTC-5, the power output of the i40 Depth and Bidata instruments is exclusively suited to transducers which are in direct contact with the water outside of the hull. Accordingly, while an P79 transducer would have been recommended for use with an i50 Depth, i50 Tridata, or iTC-5, it would not have been recommended for use with an i40 Depth & Bidata instrument. Unless seeking install thru-hull transducer, it would be recommended that the i40 Depth be replaced with i50 Depth or i50 Tridata instrument.