[CA] [CA11] ST2000+ remote control by ST 6002 Smart Pilot controller?

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Hi Chuck.
in the end I connected the ST6002 to the ST2000 by Seatalk 1 (with no power connection - please refer to the last post on thread "[CA11] ST60+, seatalk1, seatalk NG, ray55e, A70D and ST2000+" for full layout details).

It all works fine and displays relevant status and warning messages but I'm finding that some functions don't work as expected.
For example:
- I can no longer use the +10, or -10 buttons (on either the ST200 or the ST6002) to adjust course setting when in Auto, Track or Vane modes.
- I cannot use the ST6002 +10/-10 or +1/-1 buttons to steer the boat with the Autopilot in Stand-by but I can still do this type of steering (non-follow up) directly from the ST2000.
Q1. Do you have any suggestions to enable these functions?

- I've noticed that when the ST2000 is initially connected the heading displayed on the ST60+ Graphic instruments is randomly in error but once I first switch to Auto the correct heading is displayed from then on.
Q2. Do you think there is a problem here? Perhaps it is a problem with power up/connection sequence?
Q3. Should it matter what order things re turned on/connected in?
cheers
Dave