Satfinder HD is an effective app to align satellite dishes. It allows you to select the satellite you need and find the exact location of your antenna and will show the necessary information to locate your antenna and find the right signal, has built to tell the exact angle (azimuth) to where you would point your antenna compass.
Version 1.0 is the list of satellites available in the Americas. Compatible with iOS 7.0 or later.
Version 1.1 has support for 176 satellites around the planet. Compatible with iOS 7.0 or later.