I have been using Sky Safari Plus 5 for Android and a SkyBT controller to control two Celestron telescopes for the last several months. Everything works great. However, I recently got a new telescope, an Orion XT12g, and I am experiencing a very strange behavior with SkySafari.
I start off by turning on the telescope and entering all of the location, date and time information in the hand controller. It has the Synscan version 4 controller. I then do an alignment with the hand controller. After that, I turn on the SkyBT and connect SkySafari to the telescope. It takes three connection attempts to work, but it connects to the telescope, and the SkySafari screen shows exactly where the telescope is pointed. So far, so good.
The weird thing is that, intermittently, when I select an object and hit "go to" on the Sky Safari screen, the telescope will slew to the object and the field of view indicator will come to rest on the object on the SkySafari screen. But then, after pausing very briefly, the telescope slews away from the object by a degree or two, usually down in altitude, but sometimes to the left in azimuth. The move is sudden and rapid, and is only in one direction (down or left from the object). The view on SkySafari changes when this happens and it shows the field of view away from the selected object. So SkySafari knows exactly where the telescope is pointed, and that it is NOT on the object that I asked it to go to.
As a test, when this happened, I entered the same object in the hand controller for the telescope, and the goto worked just fine. So I believe this is a SkySafari problem.
On some occasions, if I hit "goto" again, on the 3rd or 5th try it will actually land on the object and stay there. Other times, it just repeats the same behavior over and over again and I have to move the telescope with the directional buttons on the SkySafari screen to get back to the object. When I do this, the object is there (in other words, the view on the SkySafari screen is in agreement with what the telescope is actually pointing at).
It does not do this consistently. Sometimes the goto works perfectly fine. The only pattern to the behavior I noticed was that it seemed to occur more with objects closer to the north celestial pole (Perseus, Cassiopea, etc.) and didn't happen with objects farther south (Orion, Taurus, etc.).
Any assistance you could provide in resolving this problem would be greatly appreciated.