Hello Marc, Phil et al,
Apologies for not chipping in - for some reason I wasn't getting emails from the thread so didn't realise things were being posted until logging in .... software
SharpSky defaults to an arbitrary position of 25000 out of the box. In the driver you can set a minimum & maximum step value that the driver prevents you from exceeding in either direction - defaults min/max are 0 & 150,000 respectively which is a lot of travel. If you want to change to another position but not physically move the focuser you can use the 'Initial focuser position' and 'set position' feature on the setup window.
Temperature compensation has a 'Compensation resume' feature. Say you are imaging one night using temperature compensation to track. The last temperature & position used before disconnection is stored by the driver. On a subsequent night one may wish to continue with the same target but the temperature may be very different. By using the resume feature the focuser will automatically make a step movement to the new temperature based position getting you very close to focus before you start the second session.
If have attempted to explain this in the manual but if there are questions or ambiguities please fire away and I will try and clarify
Cheers, hope your skies are clearer than here !
Dave