diff --git a/ArduPlane/APM_Config.h b/ArduPlane/APM_Config.h
index 7282760e37..0b6ab4d724 100644
--- a/ArduPlane/APM_Config.h
+++ b/ArduPlane/APM_Config.h
@@ -5,7 +5,6 @@
 
 // For example if you wanted the Port 3 baud rate to be 38400 you would add a statement like the one below (uncommented)
 //#define SERIAL3_BAUD        38400
-//#define GCS_PROTOCOL        GCS_PROTOCOL_NONE
 
 
 // You may also put an include statement here to point at another configuration file.  This is convenient if you maintain
diff --git a/ArduPlane/APM_Config_mavlink_hil.h b/ArduPlane/APM_Config_mavlink_hil.h
index 23968a9773..38cff467b5 100644
--- a/ArduPlane/APM_Config_mavlink_hil.h
+++ b/ArduPlane/APM_Config_mavlink_hil.h
@@ -13,9 +13,6 @@
 #define FLIGHT_MODE_5       STABILIZE
 #define FLIGHT_MODE_6       MANUAL
 
-// Hardware in the loop  protocol
-#define HIL_PROTOCOL        HIL_PROTOCOL_MAVLINK
-
 // HIL_MODE SELECTION
 //
 // Mavlink supports
@@ -23,11 +20,6 @@
 // 2. HIL_MODE_SENSORS: full sensor simulation
 #define HIL_MODE            HIL_MODE_ATTITUDE
 
-// You can set your gps protocol here for your actual
-// hardware and leave it without affecting the hardware
-// in the loop simulation
-#define GPS_PROTOCOL 		GPS_PROTOCOL_MTK
-
 // Sensors
 // All sensors are supported in all modes.
 // The magnetometer is not used in 
diff --git a/ArduPlane/GCS.h b/ArduPlane/GCS.h
index 3fba61c76b..21aa40d7d1 100644
--- a/ArduPlane/GCS.h
+++ b/ArduPlane/GCS.h
@@ -99,7 +99,6 @@ protected:
 /// @class	GCS_MAVLINK
 /// @brief	The mavlink protocol for qgroundcontrol
 ///
-#if GCS_PROTOCOL == GCS_PROTOCOL_MAVLINK || HIL_PROTOCOL == HIL_PROTOCOL_MAVLINK
 class GCS_MAVLINK : public GCS_Class
 {
 public:
@@ -163,10 +162,6 @@ private:
 	AP_Int16 streamRateExtra1;
 	AP_Int16 streamRateExtra2;
 	AP_Int16 streamRateExtra3;
-
-
-    
 };
-#endif // GCS_PROTOCOL_MAVLINK
 
 #endif // __GCS_H
diff --git a/ArduPlane/config.h b/ArduPlane/config.h
index ee2c149362..be76ce2426 100644
--- a/ArduPlane/config.h
+++ b/ArduPlane/config.h
@@ -111,17 +111,6 @@
 # define GPS_PROTOCOL GPS_PROTOCOL_AUTO
 #endif
 
-//////////////////////////////////////////////////////////////////////////////
-// GCS_PROTOCOL
-// GCS_PORT
-//
-#ifndef GCS_PROTOCOL
-# define GCS_PROTOCOL		GCS_PROTOCOL_MAVLINK
-#endif
-#ifndef GCS_PORT
-# define GCS_PORT			3
-#endif
-
 #ifndef MAV_SYSTEM_ID
 # define MAV_SYSTEM_ID		1
 #endif
diff --git a/ArduPlane/defines.h b/ArduPlane/defines.h
index e905d02554..b049d477bd 100644
--- a/ArduPlane/defines.h
+++ b/ArduPlane/defines.h
@@ -51,21 +51,10 @@
 #define CH_YAW CH_4
 
 // HIL enumerations
-#define HIL_PROTOCOL_XPLANE			1
-#define HIL_PROTOCOL_MAVLINK		2
-
 #define HIL_MODE_DISABLED			0
 #define HIL_MODE_ATTITUDE			1
 #define HIL_MODE_SENSORS			2
 
-// GCS enumeration
-#define GCS_PROTOCOL_STANDARD		0	// standard APM protocol
-#define GCS_PROTOCOL_LEGACY			1	// legacy ArduPilot protocol
-#define GCS_PROTOCOL_XPLANE			2	// X-Plane HIL simulation
-#define GCS_PROTOCOL_DEBUGTERMINAL	3	//Human-readable debug interface for use with a dumb terminal
-#define GCS_PROTOCOL_MAVLINK	        4	// binary protocol for qgroundcontrol
-#define GCS_PROTOCOL_NONE			-1	// No GCS output
-
 // Auto Pilot modes
 // ----------------
 #define MANUAL 0