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Thanks Alan, I have downloaded Mobile Observatory from Google Play to run on the Android tablet. I did have to input my home GPS co-ordinates (because there is no onboard GPS in the tablet) and would have to update the location fix whenever I go elsewhere. The feature I liked about Mobile Observatory is that it has a big catalog, and I just have to input the NGC# or M#, name, etc and it will tell me where it is and the direction to go relative to my last position in the sky (with a red arrow). It displays in Azi/alt format as well as Ra/Dec, so it suits my needs there. The menu is not exactly intuitive (took me a while to figure out how to search for an object) but it looks promising as a solution.
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