Do we know that there are any mounts for which the current SGP approach is not working well, assuming the mount does not have a pointing model? If that is in fact, true, then why would anyone want to use a pointing model? My Gemini 2 has always done an amazing job of putting me within 2-10 pixels with usually 2 slews, sometimes 3. This has been true even if it started being off several degrees like when I manually move it around, perhaps for balancing. After the first plate solve and sync, it is right on for the next slew, well within 50 pixels. I have never used a pointing model.
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