Stellarium software.
A number of people have this one and from a beginner astronomy landscape photographers point of view it is awesome. One can use it to see where the Milky way will be during a photo shoot and plan to have it where you want it to be for a shot.
However for some reason it won’t load onto my Samsung 10.1 tablet. I will have to bring it to the next meeting. (My car, yes the new one, has been out of action for the last fortnight, new brake pads and a leaking tranmission oil pan). So I will endeavour to get out there, with tablet next time Simon is out there :).