Hi Richard
You've probably found what you need, but anyway... It seems you might not know what the Argo Navis actually is, in which case I offer the following:
The Argo Navis is a device that will tell you where to point your telescope to find things in the night sky, such as stars, planets, clusters, nebulae, etc. It won't move your scope for you like a 'go-to' system does, and is thus known as a 'push-to' system because you have to do the pushing of the scope. (It can be coupled with other devices to turn it into a 'go-to' system though).
You really need to let us know your level of knowledge on these systems and in astronomy in general, and what type of astro equipment you already have, so we can help you more.
PS: I've only had mine a short time and I love it.
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