I have recently fitted Argo Navis to my GSO 10" Dob, the hardware kit provided is excellent and installation was very easy (no more than 30 minutes), just a few screws and one small hole to drill in the side of the mount.
It would be hard to overstate the value of AN for me, it is simply an amazing product, I can now find any visible object in sky within a few seconds - it has completely transformed the experience for me.
As well as a built-in library of 30,000 objects with cool features like Tour Mode (does what it sounds like) I can also use software like AstroPlanner to plan my nights viewing in advance and download the plan to the AN unit as a "user catalog"..
I could go on (and on)..
As IceMan suggests, It would be hard to think of a better investment in this hobby.
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