1 files changed, 11 insertions, 0 deletions
diff --git a/main/src/cgeo/geocaching/DirectionProvider.java b/main/src/cgeo/geocaching/DirectionProvider.java
index 7bb940f..2f54b41 100644
--- a/main/src/cgeo/geocaching/DirectionProvider.java
+++ b/main/src/cgeo/geocaching/DirectionProvider.java
@@ -60,4 +60,15 @@ public class DirectionProvider extends MemorySubject<Float> implements SensorEve
         return Compatibility.getDirectionNow(direction, activity) % 360;
     }
 
+    /**
+     * Return the angle to turn of to go from an angle to the other
+     *
+     * @param from the origin angle in degrees, in the [0, 360[ range
+     * @param to the target angle in degreees, in the [0, 360[ range
+     * @return a value in degrees, in the [-180, 180[ range
+     */
+    public static double difference(final double from, final double to) {
+        return (to - from + 360 + 180) % 360 - 180;
+    }
+
 }