diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_BBB_PRU.h b/libraries/AP_RangeFinder/AP_RangeFinder_BBB_PRU.h
index de1f8c1375..5afe4ca4f0 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_BBB_PRU.h
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_BBB_PRU.h
@@ -27,7 +27,7 @@ public:
     static bool detect();
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 
diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_Benewake.h b/libraries/AP_RangeFinder/AP_RangeFinder_Benewake.h
index 6641866934..570667b7ab 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_Benewake.h
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_Benewake.h
@@ -23,7 +23,7 @@ public:
     static bool detect(AP_SerialManager &serial_manager, uint8_t serial_instance);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 
diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_LeddarOne.h b/libraries/AP_RangeFinder/AP_RangeFinder_LeddarOne.h
index 19c1bb4a55..0253ef0509 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_LeddarOne.h
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_LeddarOne.h
@@ -50,7 +50,7 @@ public:
     static bool detect(AP_SerialManager &serial_manager, uint8_t serial_instance);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 
diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_LightWareI2C.h b/libraries/AP_RangeFinder/AP_RangeFinder_LightWareI2C.h
index 1f2b1c10be..ada0dac8b1 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_LightWareI2C.h
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_LightWareI2C.h
@@ -13,7 +13,7 @@ public:
                                           AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 
diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_LightWareSerial.h b/libraries/AP_RangeFinder/AP_RangeFinder_LightWareSerial.h
index d3590cd363..a1b60898fd 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_LightWareSerial.h
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_LightWareSerial.h
@@ -16,7 +16,7 @@ public:
     static bool detect(AP_SerialManager &serial_manager, uint8_t serial_instance);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 
diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_MAVLink.h b/libraries/AP_RangeFinder/AP_RangeFinder_MAVLink.h
index 829a1298c2..fcd0ba3685 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_MAVLink.h
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_MAVLink.h
@@ -17,10 +17,10 @@ public:
     static bool detect();
 
     // update state
-    void update(void);
+    void update(void) override;
 
     // Get update from mavlink
-    void handle_msg(mavlink_message_t *msg);
+    void handle_msg(mavlink_message_t *msg) override;
 
 protected:
 
diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_MaxsonarI2CXL.h b/libraries/AP_RangeFinder/AP_RangeFinder_MaxsonarI2CXL.h
index 01b5ed4fa1..d9c4d74604 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_MaxsonarI2CXL.h
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_MaxsonarI2CXL.h
@@ -15,7 +15,7 @@ public:
                                           AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 
diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_MaxsonarSerialLV.h b/libraries/AP_RangeFinder/AP_RangeFinder_MaxsonarSerialLV.h
index c374986044..c254029222 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_MaxsonarSerialLV.h
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_MaxsonarSerialLV.h
@@ -16,7 +16,7 @@ public:
     static bool detect(AP_SerialManager &serial_manager, uint8_t serial_instance);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 
diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_PWM.h b/libraries/AP_RangeFinder/AP_RangeFinder_PWM.h
index d4092d7e42..a07c7aa006 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_PWM.h
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_PWM.h
@@ -30,7 +30,7 @@ public:
     static bool detect();
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 
diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_PX4_PWM.h b/libraries/AP_RangeFinder/AP_RangeFinder_PX4_PWM.h
index 9950771ee1..7abfc577cd 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_PX4_PWM.h
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_PX4_PWM.h
@@ -30,7 +30,7 @@ public:
     static bool detect();
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 
diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_TeraRangerI2C.h b/libraries/AP_RangeFinder/AP_RangeFinder_TeraRangerI2C.h
index 7005a08865..3ee702e26b 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_TeraRangerI2C.h
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_TeraRangerI2C.h
@@ -12,7 +12,7 @@ public:
                                           AP_HAL::OwnPtr<AP_HAL::I2CDevice> i2c_dev);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 
diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_VL53L0X.h b/libraries/AP_RangeFinder/AP_RangeFinder_VL53L0X.h
index d557576426..1e12ee52e2 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_VL53L0X.h
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_VL53L0X.h
@@ -12,7 +12,7 @@ public:
     static AP_RangeFinder_Backend *detect(RangeFinder::RangeFinder_State &_state, AP_HAL::OwnPtr<AP_HAL::I2CDevice> dev);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 
diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_analog.h b/libraries/AP_RangeFinder/AP_RangeFinder_analog.h
index 090b2f4d71..620e465c2e 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_analog.h
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_analog.h
@@ -13,7 +13,7 @@ public:
     static bool detect(RangeFinder::RangeFinder_State &_state);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected:
 
diff --git a/libraries/AP_RangeFinder/AP_RangeFinder_uLanding.h b/libraries/AP_RangeFinder/AP_RangeFinder_uLanding.h
index af973deba2..240e004fa8 100644
--- a/libraries/AP_RangeFinder/AP_RangeFinder_uLanding.h
+++ b/libraries/AP_RangeFinder/AP_RangeFinder_uLanding.h
@@ -16,7 +16,7 @@ public:
     static bool detect(AP_SerialManager &serial_manager, uint8_t serial_instance);
 
     // update state
-    void update(void);
+    void update(void) override;
 
 protected: