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Most goto systems come packaged with the initial purchase however there are (were) some exceptions. I bought a non-goto EQ6 and had it upgraded 12 months later to a goto model. You can also retro-fit an argo navis. This system is not strictly goto in that the motors don't drive the mount to the object but the system shows you which way to move the mount to find the object. It is also possible to retro-fit motors to a non motorised mount.
However - if you think you might want goto I'd recommend buying a goto mount up-front as you will save a fair bit of money compared to retro-fitting one.
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