diff --git a/ArduCopter/APM_Config.h b/ArduCopter/APM_Config.h
index 1838c3bd4f..f356b0ccc6 100644
--- a/ArduCopter/APM_Config.h
+++ b/ArduCopter/APM_Config.h
@@ -63,5 +63,5 @@
 #define USERHOOK_VARIABLES "UserVariables.h"
 
 
-// enable this for the new 'purple' hardware
-// #define CONFIG_APM_HARDWARE APM_HARDWARE_PURPLE
+// enable this for the new 'APM2' hardware
+// #define CONFIG_APM_HARDWARE APM_HARDWARE_APM2
diff --git a/ArduCopter/ArduCopter.pde b/ArduCopter/ArduCopter.pde
index e9075346f1..c498f3ac98 100644
--- a/ArduCopter/ArduCopter.pde
+++ b/ArduCopter/ArduCopter.pde
@@ -114,8 +114,8 @@ static void update_events(void);
 ////////////////////////////////////////////////////////////////////////////////
 // RC Hardware
 ////////////////////////////////////////////////////////////////////////////////
-#if CONFIG_APM_HARDWARE == APM_HARDWARE_PURPLE
-    APM_RC_Purple APM_RC;
+#if CONFIG_APM_HARDWARE == APM_HARDWARE_APM2
+    APM_RC_APM2 APM_RC;
 #else
     APM_RC_APM1 APM_RC;
 #endif
@@ -123,8 +123,8 @@ static void update_events(void);
 ////////////////////////////////////////////////////////////////////////////////
 // Dataflash
 ////////////////////////////////////////////////////////////////////////////////
-#if CONFIG_APM_HARDWARE == APM_HARDWARE_PURPLE
-    DataFlash_Purple DataFlash;
+#if CONFIG_APM_HARDWARE == APM_HARDWARE_APM2
+    DataFlash_APM2 DataFlash;
 #else
     DataFlash_APM1   DataFlash;
 #endif
diff --git a/ArduCopter/Makefile b/ArduCopter/Makefile
index a1cf10a01a..712e288804 100644
--- a/ArduCopter/Makefile
+++ b/ArduCopter/Makefile
@@ -18,8 +18,8 @@ hilnocli:
 heli:
 	make -f Makefile EXTRAFLAGS="-DFRAME_CONFIG=HELI_FRAME"
 
-purple:
-	make -f Makefile EXTRAFLAGS="-DCONFIG_APM_HARDWARE=APM_HARDWARE_PURPLE -DCLI_SLIDER_ENABLED=DISABLED"
+apm2:
+	make -f Makefile EXTRAFLAGS="-DCONFIG_APM_HARDWARE=APM_HARDWARE_APM2 -DCLI_SLIDER_ENABLED=DISABLED"
 
 mavlink10:
 	make -f Makefile EXTRAFLAGS="-DHIL_MODE=HIL_MODE_ATTITUDE -DMAVLINK10 -DCLI_ENABLED=DISABLED -DLOGGING_ENABLED=DISABLED"
diff --git a/ArduCopter/config.h b/ArduCopter/config.h
index 66172fba5d..60562b5080 100644
--- a/ArduCopter/config.h
+++ b/ArduCopter/config.h
@@ -43,10 +43,10 @@
 #endif
 
 //////////////////////////////////////////////////////////////////////////////
-// PURPLE HARDWARE DEFAULTS
+// APM2 HARDWARE DEFAULTS
 //
 
-#if CONFIG_APM_HARDWARE == APM_HARDWARE_PURPLE
+#if CONFIG_APM_HARDWARE == APM_HARDWARE_APM2
 # define CONFIG_IMU_TYPE   CONFIG_IMU_MPU6000
 # define CONFIG_PUSHBUTTON DISABLED
 # define CONFIG_RELAY      DISABLED
@@ -108,7 +108,7 @@
 # define SLIDE_SWITCH_PIN 40
 # define PUSHBUTTON_PIN   41
 # define USB_MUX_PIN      -1
-#elif CONFIG_APM_HARDWARE == APM_HARDWARE_PURPLE
+#elif CONFIG_APM_HARDWARE == APM_HARDWARE_APM2
 # define A_LED_PIN        27
 # define B_LED_PIN        26
 # define C_LED_PIN        25
diff --git a/ArduCopter/defines.h b/ArduCopter/defines.h
index 18bbf19ac1..63597b2a9c 100644
--- a/ArduCopter/defines.h
+++ b/ArduCopter/defines.h
@@ -354,6 +354,6 @@ enum gcs_severity {
 
 // APM Hardware selection
 #define APM_HARDWARE_APM1 1
-#define APM_HARDWARE_PURPLE 2
+#define APM_HARDWARE_APM2 2
 
 #endif // _DEFINES_H
diff --git a/ArduCopter/system.pde b/ArduCopter/system.pde
index 08c1ed1bb0..2da7c7f319 100644
--- a/ArduCopter/system.pde
+++ b/ArduCopter/system.pde
@@ -56,7 +56,7 @@ static void run_cli(void)
 static void init_ardupilot()
 {
 #if USB_MUX_PIN > 0
-    // on the purple board we have a mux thet switches UART0 between
+    // on the APM2 board we have a mux thet switches UART0 between
     // USB and the board header. If the right ArduPPM firmware is
     // installed we can detect if USB is connected using the
     // USB_MUX_PIN
@@ -235,7 +235,7 @@ static void init_ardupilot()
         adc.Init(&timer_scheduler);       // APM ADC library initialization
 #endif // CONFIG_ADC
 
-#if CONFIG_APM_HARDWARE == APM_HARDWARE_PURPLE
+#if CONFIG_APM_HARDWARE == APM_HARDWARE_APM2
         barometer.Init(1, true);
 #else
         barometer.Init(1, false);