diff --git a/src/modules/controllib/block/Block.hpp b/src/modules/controllib/block/Block.hpp
index 736698e213..9bd80b15bd 100644
--- a/src/modules/controllib/block/Block.hpp
+++ b/src/modules/controllib/block/Block.hpp
@@ -93,6 +93,11 @@ protected:
 	List<uORB::SubscriptionBase *> _subscriptions;
 	List<uORB::PublicationBase *> _publications;
 	List<BlockParamBase *> _params;
+
+private:
+	/* this class has pointer data members and should not be copied (private constructor) */
+	Block(const control::Block&);
+	Block operator=(const control::Block&);
 };
 
 class __EXPORT SuperBlock :
diff --git a/src/modules/navigator/module.mk b/src/modules/navigator/module.mk
index 637eaae593..b501989961 100644
--- a/src/modules/navigator/module.mk
+++ b/src/modules/navigator/module.mk
@@ -54,3 +54,5 @@ SRCS		= navigator_main.cpp \
 INCLUDE_DIRS	 += $(MAVLINK_SRC)/include/mavlink
 
 MODULE_STACKSIZE = 1200
+
+EXTRACXXFLAGS	= -Weffc++
diff --git a/src/modules/navigator/navigator.h b/src/modules/navigator/navigator.h
index bf6e2ea0e6..8edbb63b35 100644
--- a/src/modules/navigator/navigator.h
+++ b/src/modules/navigator/navigator.h
@@ -222,5 +222,11 @@ private:
 	 * Publish a new position setpoint triplet for position controllers
 	 */
 	void		publish_position_setpoint_triplet();
+
+	/* this class has ptr data members, so it should not be copied,
+	 * consequently the copy constructors are private.
+	 */
+	Navigator(const Navigator&);
+	Navigator operator=(const Navigator&);
 };
 #endif
diff --git a/src/modules/navigator/navigator_main.cpp b/src/modules/navigator/navigator_main.cpp
index 1a5ba4c1a4..93cbfd7b1e 100644
--- a/src/modules/navigator/navigator_main.cpp
+++ b/src/modules/navigator/navigator_main.cpp
@@ -105,17 +105,18 @@ Navigator::Navigator() :
 	_control_mode_sub(-1),
 	_onboard_mission_sub(-1),
 	_offboard_mission_sub(-1),
+	_param_update_sub(-1),
 	_pos_sp_triplet_pub(-1),
-	_vstatus({}),
-	_control_mode({}),
-	_global_pos({}),
-	_home_pos({}),
-	_mission_item({}),
-	_nav_caps({}),
-	_pos_sp_triplet({}),
+	_vstatus{},
+	_control_mode{},
+	_global_pos{},
+	_home_pos{},
+	_mission_item{},
+	_nav_caps{},
+	_pos_sp_triplet{},
 	_mission_item_valid(false),
 	_loop_perf(perf_alloc(PC_ELAPSED, "navigator")),
-	_geofence({}),
+	_geofence{},
 	_geofence_violation_warning_sent(false),
 	_fence_valid(false),
 	_inside_fence(true),
@@ -124,6 +125,8 @@ Navigator::Navigator() :
 	_loiter(this, "LOI"),
 	_rtl(this, "RTL"),
 	_offboard(this, "OFF"),
+	_can_loiter_at_sp(false),
+	_pos_sp_triplet_updated(false),
 	_param_loiter_radius(this, "LOITER_RAD"),
 	_param_acceptance_radius(this, "ACC_RAD")
 {
diff --git a/src/modules/navigator/navigator_mode.h b/src/modules/navigator/navigator_mode.h
index a7ba79bba7..de5545dcb1 100644
--- a/src/modules/navigator/navigator_mode.h
+++ b/src/modules/navigator/navigator_mode.h
@@ -88,6 +88,12 @@ protected:
 
 private:
 	bool _first_run;
+
+	/* this class has ptr data members, so it should not be copied,
+	 * consequently the copy constructors are private.
+	 */
+	NavigatorMode(const NavigatorMode&);
+	NavigatorMode operator=(const NavigatorMode&);
 };
 
 #endif