I’ll have another attempt at answering, for some reason my replies to this and other topics in recent months just disappear after pressing the submit button.
Tim,
The ‘Dome Following’ button is only active when both the Mount and the Dome are simultaneously connected in N.I.N.A and you have correctly configured the dome and telescope/mount geometry in N.I.N.A’s Options > Dome tab.
Depending on the U.I. colour scheme the ‘Dome Following’ button changes from a dark shade of grey to a lighter shade of grey when the mount and dome are both connected, it’s easier to see when the U.I. Light display mode is selected, you just click the ‘OFF’ button and it will change it’s wording to show ‘ON’.
If you haven’t yet configured, or have misconfigured the dome and mount/telescope options, then an error notification will appear when you click the ‘Dome Following’ button and the dome will be automatically disconnected in N.I.N.A.
William.