Heading COG Mismatch (E125/ACU400/EV-1/P70/I70)

[Chuck - Raymarine - Moderator]

lwitty,

Q1. Is the LEN setup correct? Given the power comes into the 5-way, not sure if that is really the "middle" of the network or not.
A1. I did indeed inspect LEN balancing within your STng network and it appears to be satisfactory.

Q2. Depth has been acting up and really noticed it since the install of the ACU400 (not sure if related or not...). I will verify that the SeaTalk power is off on the ACU400 but I have also read that removing the shield from the depth transducer to reduce noise has been recommended. If SeaTalk ACU power is off, is good next step to remove the shield (transducers where installed with the old ST instruments and individual depth and speed/temp - not a DST800).
A2. I don't suspect that the problem is rooted in the how the DST800 has been wired to the iTC-5. Should the problem not manifest itself when the vessel is stationary, operating under power alone (i.e. sails not set to expose the vessel to heeling forces) in depths up to approximately 150', then the reason for the symptom reported may simply be a limitation of the DST800's design. Unlike full size through hull instrument depth transducers, the DST800's element is half that of Depth-only or Depth/Temp transducer designed to fit within the same housing. While a good option for powerboats seeking a single transducer to support supplying the system with depth, speed, and temperature, it may more easily loose bottom contact on a heeling sailboat. Should the problem not be produced when stationary or under power only, then it would be recommended that and additional depth-only transducer (ex. E26030 D800/P17, etc.) be installed to replace supplying depth signal to the iTC-5.