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[TG11] ST2000+ not heading correctly in track mode
01-17-19, 04:02 PM (This post was last modified: 01-17-19 04:12 PM by Chuck - Raymarine - Moderator.)
Post: #1
[TG11] ST2000+ not heading correctly in track mode
Hi There,
I have an ST2000+ tiller pilot interfaced (by via ST1 to STNG converter) with ST60+ instruments and an A70D Plotter/MFD.
Communication seems to be working ok, pilot pop ups appear on the ST60 displays and wind and track data appear on the ST2000+ When it is in the appropriate modes.

I can set up a route or waypoint and enter in to track mode ok.
However, I have noticed one glitch when the autopilot is in track mode.

Although BTW, Heading and COG all appear to be sensible, the autopilot seems to want to head 10-15 degrees to port of the BTW. I have tried this on a range of track headings.
I suspect that the error is that magnetic variation (about 13E here) is being applied once too often somewhere in the system.
I have variation in auto on the ST 60+ Graphic and on the A70D plotter.

Could you please advise the correct variation settings for each instrument/display and let me know if there are any other configuration changes I should check out and correct?
I am planning further test in the next few days, so if there’s anything I need to do to get you more data to work with please let me know.
Regards
Dave Davies.
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01-17-19, 08:56 PM
Post: #2
RE: [TG11] ST2000+ not heading correctly in track mode
Hello Dave,

Well spotted! If a pilot steers well in Auto but not in Track mode then a heading error is almost always the cause, and incorrect or inconsistent Variation is a very common cause. For anyone else reading this, chartplotters work in True, whereas pilots steer to magnetic heading, so a conversion for the local magnetic variation needs to be applied. Depending on what's connected and how, the applied variation can be correct, inverted, double-applied or zero, and all except the first of these will cause incorrect conversion and inability to steer correctly in Track mode.

In your case, Dave, I think you're not getting variation through the convertor from the A70D on STNG to the ST1 side. One test for this would be to toggle the ST60+ Graphic between True and Magnetic heading display. I suspect you'll see both showing the same value (zero variation.)

You can manually configure variation on the ST2000+ in the Calibration menu. See section 6.1, p60 of the ST2000+ handbook.

Regards,
Tom

Raymarine since 1999.
Interests: Diagnosis of problems in sonar/fishfinders, NMEA2000, ethernet comms, autopilots, thermal cameras
Location: Sydney, Australia
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02-02-19, 12:01 PM
Post: #3
RE: [TG11] ST2000+ not heading correctly in track mode
Hi Tom,
thanks for the advice, what I have found I needed to do to get the system to work was to:
- set the variation to 13E on the ST 2000+
- set the variation to zero on the A70D
- set the bearing mode to magnetic on the A70D

The boat tracks perfectly now.
I think the problem was that both the ST2000 and the A70D were sending variation to the system and this was causing confusion.

thanks
Dave
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02-08-19, 02:38 PM
Post: #4
RE: [TG11] ST2000+ not heading correctly in track mode
You're welcome.
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