[CA] [CA11] E90w/e120w not following saved routes properly

[Dustdevil]

Hi Folks,
Sit back, grab a cup of something hot and dig into this one.
I'm working on a system right now with multiple Raymarine networks going and have a strange problem to report. Hopefully it's been seen before and is a simple fix.

The boat will go to a waypoint just fine, but will not follow a route properly. It follows a parallel course about .3km to the east. Heading of the icon changes slightly at times while following.

The yacht in question has 2 MFD's, an e120w at the nav and an e90w at the helm. They are networked together via Seatalk hs thru a Sirius weather module with multiple ports. The radar networks here as well, and it's a rd418hd.

The boat also has a Seatalk ng network that the raystar 130 gps, raymarine AIS, and Evolution A/P connects to, which is running an ACU-400, R70 control head and EV-2 heading sensor.

The boat runs standard Seatalk with ST-60 wind, speed and depth. It had previously had an ancient ST7000 autopilot networked in that was replaced to solve the current problem, with no joy.

Commissioning of the new autopilot went very smoothly with little deviation and excellent steering characteristic with the exception of the route following.

Thoughts?

[Chuck - Raymarine - Moderator]

Welcome to the Raymarine Forum Dustdevil,

Please note that you have listed an EV-2 CCU within the equipment list. The EV-2 CCU is not used within systems having a ACU. Systems having an ACU must have an EV-1 CCU.

Should the Evolution autopilot components all have been updated with the latest available Raymarine product software updates and the autopilot's Response Level setting have been configured to Performance, then this problem would typically be attributed to a fault or incorrect setting within the navigation system. Should the E-Series Widescreen MFDs not have been updated with the final E-Series Widescreen MFD software update (v2.65), then the software within the MFD's should likewise be updated. The MFD's Chart Datum configuration setting should also be configured to WGS 1984. Finally, the reported GPS HDOP value should be inspected within the MFD's GPS Status dialog to ensure that it's value is low (typically less than or equal to 1.0). If the GPS HDOP is high then the position accuracy will be off and performance such as you have described may result.

After verifying the above listed items, the system should be tested again to verify performance. In doing so, please note that when operating in Track mode, the system's task will be to ensure that the vessel remains within a corridor of equal with on each side of the course line. The width of this corridor is dictated by the autopilot's Response Level setting.