diff --git a/ArduCopter/defines.h b/ArduCopter/defines.h
index 89d93f85b9..bd065d1a37 100644
--- a/ArduCopter/defines.h
+++ b/ArduCopter/defines.h
@@ -94,25 +94,12 @@
 #define X_FRAME 1
 #define V_FRAME 2
 
-// LED output
-#define NORMAL_LEDS 0
-#define SAVE_TRIM_LEDS 1
-
-
 // Internal defines, don't edit and expect things to work
 // -------------------------------------------------------
 
-#define TRUE 1
-#define FALSE 0
 #define ToRad(x) radians(x)	// *pi/180
 #define ToDeg(x) degrees(x)	// *180/pi
 
-#define DEBUG 0
-#define LOITER_RANGE 60 // for calculating power outside of loiter radius
-
-#define T6 1000000
-#define T7 10000000
-
 // GPS type codes - use the names, not the numbers
 #define GPS_PROTOCOL_NONE       -1
 #define GPS_PROTOCOL_NMEA       0
@@ -129,11 +116,6 @@
 #define HIL_MODE_ATTITUDE               1
 #define HIL_MODE_SENSORS                2
 
-// Altitude status definitions
-#define REACHED_ALT                     0
-#define DESCENDING                      1
-#define ASCENDING                       2
-
 // Auto Pilot modes
 // ----------------
 #define STABILIZE 0                     // hold level position