Trackdir                        Direction
	TRACKDIR_X_NE     =  0,         DIR_NE = 1,
	TRACKDIR_Y_SE     =  1,         DIR_SE = 3,
	TRACKDIR_UPPER_E  =  2,         DIR_E  = 2,
	TRACKDIR_LOWER_E  =  3,         DIR_E  = 2,
	TRACKDIR_LEFT_S   =  4,         DIR_S  = 4,
	TRACKDIR_RIGHT_S  =  5,         DIR_S  = 4,

	TRACKDIR_X_SW     =  8,         DIR_SW = 5,
	TRACKDIR_Y_NW     =  9,         DIR_NW = 7,
	TRACKDIR_UPPER_W  = 10,         DIR_W  = 6,
	TRACKDIR_LOWER_W  = 11,         DIR_W  = 6,
	TRACKDIR_LEFT_N   = 12,         DIR_N  = 0,
	TRACKDIR_RIGHT_N  = 13,         DIR_N  = 0,