diff --git a/ArduCopter/ArduCopter.pde b/ArduCopter/ArduCopter.pde
index fc8136f937..746f10709d 100644
--- a/ArduCopter/ArduCopter.pde
+++ b/ArduCopter/ArduCopter.pde
@@ -354,7 +354,8 @@ static bool 	did_ground_start	= false;		// have we ground started after first ar
 static bool	nav_ok;
 static const float radius_of_earth 	= 6378100;		// meters
 static const float gravity 			= 9.81;			// meters/ sec^2
-static int32_t		target_bearing;						// deg * 100 : 0 to 360 location of the plane to the target
+static int32_t	target_bearing;						// deg * 100 : 0 to 360 location of the plane to the target
+static int32_t 	home_bearing;						// used to track difference in angle
 
 static byte	wp_control;								// used to control - navgation or loiter