Thanks for your input.
Now that my grey-matter is starting to recover after the festive season, I realise that in my case I should invoke PEC since when using my SBIG/AO7 system, no guide commands are sent to the mount unless it is outside the capture range of the AO7. Hence if I can keep the mount reasonably in the right place, the AO7 should sort out the rest without talking to the mount.
BC
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