Fix for reversed pitch in SIMPLE mode.

git-svn-id: https://arducopter.googlecode.com/svn/trunk@1779 f9c3cf11-9bcb-44bc-f272-b75c42450872

ArduCopterMega/navigation.pde

@@ -105,7 +105,7 @@ void calc_waypoint_nav()
 
 	// rotate the vector
 	nav_roll 	=  (float)nav_lat * cos_nav_x;
-	nav_pitch 	= (float)nav_lat * sin_nav_y;
+	nav_pitch 	= -(float)nav_lat * sin_nav_y;
 
 	//Serial.printf("R%ld, P%ld ", nav_roll, nav_pitch);