[quote=“Martyk22, post:3, topic:855, full:true”]
I understand the need to plate solve the target after the flip to confirm the location. it’s the need to plate solve before the flip that I don’t understand.
[/quote] I don’t think there is one. All it does is make the pier flip process more time consuming, more complex and less reliable.
All a pier flip does is a slew to the current position when the mount is in the state where it will prefer to move to the other side of the pier. The trick is determining when the mount is in that state.
For unsophisticated mounts, such as the SB mounts, you can’t tell when this is so you have to guess - and that is usually when it’s well past the meridian. There may be more control available for SB provided imaging applications but it isn’t available through their scripting so for our purposes it isn’t available.
More sophisticated mounts, such as the Celestron GEMs, have a property that can be read to say which side of the pier a slew will end up on - Destination Side Of Pier. The Celestron mounts using the NS and NS+ HCs also have the ability to chose which side of pier to use. This can be used to move the mount to the side of the pier you want independently of the position of the target relative to the meridian - within limits of course. It may be possible to slew to a target position early and avoid having to do a meridian flip at all.
By the way, the problem with sync on Celestron mounts is ONLY for the StarSense and even then only when the sync is done after the meridian has been passed.