Motorola Defy +  Android 2.3. Works as advertised. Sky view follows phone screen orientation accurately  both in azimut and in elevation. 4 stars only due to comparison with SkEye  as I haven't found how Sky Map can show basic details for the celestial body at the screen center and how Sky Map can show celestial position of the screen center (SkEye can show this information). Allows to search a specific celestial body (but you need to remember the name as you have to type it; I could not find a list of celestial bodies  list that is available with SkEye) and shows on the screen an arrow allowing to orientate the screen towards the searched body. It is not always clear if the GPS position has locked correctly: it is necessary to use an other application to check that the GPS position is being acquired properly (SkEye shows when starting the GPS status with number of visible and used satellites and informs when a GPS position has been acquired properly). Small foot print (less than 0.5MB) and can be moved to SDCard. No adds that I could see. So far good enough for me although I prefer SkEye for the reasons described previously. Thanks to the developer.
August 25 2016