Turn your device into pocket compass and have your right direction always in your hand.
Pick a skin from the colorwheel which will fit you best.
The compass depends on the performance of your device exactly. If the compass works perfectly, it means that your sensors are perfect, too.
If it is inaccurate you should:
• move away from any magnetic fields /other devices, computers, etc./
• do a manual calibration as shown in the app
• place it horizontally to the ground