[glend (Glen)]

I have a 12" GSO dob, currently setup with azimuth setting circle on the base and an incline meter on the tube, which works great as a basic manual pushto system - as long as I know the exact co-ordinates of the object I am looking for in the sky. My problem is that azimuth alignment has to be carefully done, and my laptop (running Celestron's Skylight) has limited battery duration for giving me co-ordinates, and I find myself going back and forth between the scope and the laptop (often plugged in to the AC in the house or inverter in the camper). Also I would like to avoid having to bend down to the base each time I have to reset the azimuth (back suffers) but could live with that if I have to.

I have looked at Argo Navis (too expensive for me), and the JMI digitial setting circle system, and Sky Commander, but really only Argo Navis offers and off the self solution for the 12" GSO (again too expensive).

Is there a simple handheld computer that holds all the Azi/Alt co-ordinates for the NGC catalog, plus Messiers, etc so that I can keep it at the scope? I have a 7" Android tablet (but it doesn't have onboard GPS) so it would be great if there was an App for that - but don't mention Skeye - I have tried it and found it terrible in use. Maybe the Mobile Observatory app, any views on this?

All advice welcome.