Error on Centering has grown significantly

EQMOD has two distinct interpretations for SYNC.

1. SYNC is used to set the actual RA/DEC values (exactly what you describe under point 1)
2. SYNC is used to add to the pointing model (exactly your point 2)

The user is responsible to select the right mode in the setup, depending on what he/she wants to do.

Other ASCOM Software implementations are using this strategy (e. g. TheSkyX) and it seems that this is a necessity, once the author of the Software wants to automate the creation of a pointing model. For this reason, I think ASCOM should extend the interface and specify something like “SyncToModel” and restrain the acceptable implementation of the “sync” command to set the actual RA/DEC.

Regards
Horia