The Telescope Navigator is a Sky Map and telescope control application, which runs on Android and Raspberry Pi.
Supported telescopes: Skywatcher and compatible controllers.
Required hardwares: Android 4.0 or higher Android phone, Raspberry Pi with Wifi and USB to Serial adapter.
First, must create a Wifi network on RPi like this: http://www.maketecheasier.com/set-up-raspberry-pi-as-wireless-access-point
After that copy the tcp_serial_redirect.py to the RPi and make it runnable at boot time: http://www.instructables.com/id/Raspberry-Pi-Launch-Python-script-on-startup/?ALLSTEPS
https://play.google.com/store/apps/details?id=junge.telescopenavigator