Interesting.
Can you use a polar plot of az/el in your app? Consider
Polar Plot (Polar Graph) It was used by me to plot the positions of satellites in the overhead sky. You may be able to adapt it to your telescope app. 
Interesting.
Can you use a polar plot of az/el in your app? Consider
Polar Plot (Polar Graph) It was used by me to plot the positions of satellites in the overhead sky. You may be able to adapt it to your telescope app.