diff --git a/ArduSub/GCS_Mavlink.cpp b/ArduSub/GCS_Mavlink.cpp
index da13017832..32d2e1f8d6 100644
--- a/ArduSub/GCS_Mavlink.cpp
+++ b/ArduSub/GCS_Mavlink.cpp
@@ -217,7 +217,7 @@ uint8_t GCS_MAVLINK_Sub::sysid_my_gcs() const
     return sub.g.sysid_my_gcs;
 }
 
-bool GCS_MAVLINK_Sub::vehicle_initialised() const {
+bool GCS_Sub::vehicle_initialised() const {
     return sub.ap.initialised;
 }
 
diff --git a/ArduSub/GCS_Mavlink.h b/ArduSub/GCS_Mavlink.h
index c724428af7..0792ed2329 100644
--- a/ArduSub/GCS_Mavlink.h
+++ b/ArduSub/GCS_Mavlink.h
@@ -30,8 +30,6 @@ protected:
     int32_t global_position_int_alt() const override;
     int32_t global_position_int_relative_alt() const override;
 
-    bool vehicle_initialised() const override;
-
     bool set_home_to_current_location(bool lock) override WARN_IF_UNUSED;
     bool set_home(const Location& loc, bool lock) override WARN_IF_UNUSED;
 
diff --git a/ArduSub/GCS_Sub.h b/ArduSub/GCS_Sub.h
index 859b91cdeb..7b79293962 100644
--- a/ArduSub/GCS_Sub.h
+++ b/ArduSub/GCS_Sub.h
@@ -25,6 +25,8 @@ public:
     uint32_t custom_mode() const override;
     MAV_TYPE frame_type() const override;
 
+    bool vehicle_initialised() const override;
+
 private:
 
     GCS_MAVLINK_Sub _chan[MAVLINK_COMM_NUM_BUFFERS];