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

[lwitty]

At the boat now, here is the requested data:
- Max deviation 8 degrees
- Autopilot installed around May 1, 2017 (one reason for the upgrade is this problem existed with the old S3/Fluxgate - though new AP would solve issue). Update of all software was completed from the E125 (connected via WiFi) during initial install.

- AP components
- ACU400 - V2.23 (RSCP v1 L4)
- EV-1 - V2.17 (RSCP V1 L4)
- 2 P70s V3.07
Other RM Components
- E125 V19.03-00036
- 4kW 18" HD Color Radome (SeaTalkHS) v4.27
- 2 i70s V3.08
- RS130 GPS V2.20
- iTC5 V1.12 (wind, speed/temp & depth transducers attached)

Non-RM Components
- AMEC Camino 101 Class B AIS (connection to receive GPS from NMEA 0183 and send AIS data to E125)

Above are all the components connected (no computers other components).

Diagram is attached with the actual wiring.

I have also attached the diagnostics file for all devices (xml & html). I also have the log files which I can attached to another post if needed.