diff --git a/src/lib/mathlib/math/Matrix.hpp b/src/lib/mathlib/math/Matrix.hpp
index ea0cf4ca1e..ca931e2daf 100644
--- a/src/lib/mathlib/math/Matrix.hpp
+++ b/src/lib/mathlib/math/Matrix.hpp
@@ -69,27 +69,34 @@ public:
 
 	/**
 	 * trivial ctor
-	 * note that this ctor will not initialize elements
+	 * Initializes the elements to zero.
 	 */
-	MatrixBase() {
-		arm_mat = {M, N, &data[0][0]};
+	MatrixBase() : 
+		data{},
+		arm_mat{M, N, &data[0][0]}
+	{
 	}
 
+	virtual ~MatrixBase() {};
+
 	/**
 	 * copyt ctor
 	 */
-	MatrixBase(const MatrixBase<M, N> &m) {
-		arm_mat = {M, N, &data[0][0]};
+	MatrixBase(const MatrixBase<M, N> &m) :
+		arm_mat{M, N, &data[0][0]}
+	{
 		memcpy(data, m.data, sizeof(data));
 	}
 
-	MatrixBase(const float *d) {
-		arm_mat = {M, N, &data[0][0]};
+	MatrixBase(const float *d) :
+		arm_mat{M, N, &data[0][0]}
+	{
 		memcpy(data, d, sizeof(data));
 	}
 
-	MatrixBase(const float d[M][N]) {
-		arm_mat = {M, N, &data[0][0]};
+	MatrixBase(const float d[M][N]) : 
+		arm_mat{M, N, &data[0][0]}
+	{
 		memcpy(data, d, sizeof(data));
 	}
 
diff --git a/src/lib/mathlib/math/Vector.hpp b/src/lib/mathlib/math/Vector.hpp
index c7323c2153..0ddf776155 100644
--- a/src/lib/mathlib/math/Vector.hpp
+++ b/src/lib/mathlib/math/Vector.hpp
@@ -69,25 +69,32 @@ public:
 
 	/**
 	 * trivial ctor
-	 * note that this ctor will not initialize elements
+	 * initializes elements to zero
 	 */
-	VectorBase() {
-		arm_col = {N, 1, &data[0]};
+	VectorBase() :
+		data{},
+		arm_col{N, 1, &data[0]}
+	{
+
 	}
 
+	virtual ~VectorBase() {};
+
 	/**
 	 * copy ctor
 	 */
-	VectorBase(const VectorBase<N> &v) {
-		arm_col = {N, 1, &data[0]};
+	VectorBase(const VectorBase<N> &v) :
+		arm_col{N, 1, &data[0]}
+	{
 		memcpy(data, v.data, sizeof(data));
 	}
 
 	/**
 	 * setting ctor
 	 */
-	VectorBase(const float d[N]) {
-		arm_col = {N, 1, &data[0]};
+	VectorBase(const float d[N]) :
+		arm_col{N, 1, &data[0]}
+	{
 		memcpy(data, d, sizeof(data));
 	}
 
diff --git a/src/modules/ekf_att_pos_estimator/ekf_att_pos_estimator_main.cpp b/src/modules/ekf_att_pos_estimator/ekf_att_pos_estimator_main.cpp
index 40cb6043f3..b3eb816f99 100644
--- a/src/modules/ekf_att_pos_estimator/ekf_att_pos_estimator_main.cpp
+++ b/src/modules/ekf_att_pos_estimator/ekf_att_pos_estimator_main.cpp
@@ -112,6 +112,10 @@ public:
 	 */
 	FixedwingEstimator();
 
+	/* we do not want people ever copying this class */
+	FixedwingEstimator(const FixedwingEstimator& that) = delete;
+	FixedwingEstimator operator=(const FixedwingEstimator&) = delete;
+
 	/**
 	 * Destructor, also kills the sensors task.
 	 */
@@ -371,9 +375,10 @@ FixedwingEstimator::FixedwingEstimator() :
 	_mag_offsets({}),
 
 	#ifdef SENSOR_COMBINED_SUB
-	_sensor_combined({}),
+	_sensor_combined{},
 	#endif
 
+	_pos_ref{},
 	_baro_ref(0.0f),
 	_baro_ref_offset(0.0f),
 	_baro_gps_offset(0.0f),
@@ -390,12 +395,18 @@ FixedwingEstimator::FixedwingEstimator() :
 /* states */
 	_baro_init(false),
 	_gps_initialized(false),
+	_gps_start_time(0),
+	_filter_start_time(0),
+	_last_sensor_timestamp(0),
+	_last_run(0),
 	_gyro_valid(false),
 	_accel_valid(false),
 	_mag_valid(false),
 	_ekf_logging(true),
 	_debug(0),
 	_mavlink_fd(-1),
+	_parameters{},
+	_parameter_handles{},
 	_ekf(nullptr),
 	_velocity_xy_filtered(0.0f),
 	_velocity_z_filtered(0.0f),
diff --git a/src/modules/ekf_att_pos_estimator/estimator_utilities.cpp b/src/modules/ekf_att_pos_estimator/estimator_utilities.cpp
index 29a8c8d1e3..77cc1eeeb8 100644
--- a/src/modules/ekf_att_pos_estimator/estimator_utilities.cpp
+++ b/src/modules/ekf_att_pos_estimator/estimator_utilities.cpp
@@ -45,8 +45,11 @@ void Vector3f::zero(void)
     z = 0.0f;
 }
 
-Mat3f::Mat3f() {
-    identity();
+Mat3f::Mat3f() :
+    x{1.0f, 0.0f, 0.0f},
+    y{0.0f, 1.0f, 0.0f},
+    z{0.0f, 0.0f, 1.0f}
+{
 }
 
 void Mat3f::identity() {
diff --git a/src/modules/ekf_att_pos_estimator/module.mk b/src/modules/ekf_att_pos_estimator/module.mk
index dc5220bf0c..36d854dddb 100644
--- a/src/modules/ekf_att_pos_estimator/module.mk
+++ b/src/modules/ekf_att_pos_estimator/module.mk
@@ -41,3 +41,5 @@ SRCS		= ekf_att_pos_estimator_main.cpp \
 		  ekf_att_pos_estimator_params.c \
 		  estimator_23states.cpp \
 		  estimator_utilities.cpp
+
+EXTRACXXFLAGS	= -Weffc++