You have options, but probably best to run the internal guider (using multistar). You could run PHD2, but if you did this, you'd want to run it on the Pi4. With the latest updates to the internal guider, there's no real benefit to using PHD2 unless you can't see polaris (so need drift align from PHD2). The internal guider implements multistar guiding, Periodic Error prediction, and logs in a format compatible with the PHD LogViewer. So, probably best to just use the internal guider. The major difference you'll notice right away is that the calibrations are shorter in Ekos (but these are configurable if you so choose). You also won't have a "guiding assistant", but most folks don't really need that. Cheers, Doug

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