diff --git a/src/blackmisc/geo/coordinategeodetic.cpp b/src/blackmisc/geo/coordinategeodetic.cpp
index 7b71d2b3c..0d35fd7a9 100644
--- a/src/blackmisc/geo/coordinategeodetic.cpp
+++ b/src/blackmisc/geo/coordinategeodetic.cpp
@@ -247,6 +247,12 @@ namespace BlackMisc
             m_z = latitude.sin();
         }
 
+        void CCoordinateGeodetic::setGeodeticHeightToNull()
+        {
+            static const CAltitude na = CAltitude(0, CAltitude::MeanSeaLevel, CLengthUnit::nullUnit());
+            this->setGeodeticHeight(na);
+        }
+
         CCoordinateGeodetic &CCoordinateGeodetic::switchUnit(const CLengthUnit &unit)
         {
             m_geodeticHeight.switchUnit(unit);
diff --git a/src/blackmisc/geo/coordinategeodetic.h b/src/blackmisc/geo/coordinategeodetic.h
index a8872e74e..e73e17215 100644
--- a/src/blackmisc/geo/coordinategeodetic.h
+++ b/src/blackmisc/geo/coordinategeodetic.h
@@ -243,6 +243,9 @@ namespace BlackMisc
             //! Set height (ellipsoidal or geodetic height)
             void setGeodeticHeight(const Aviation::CAltitude &height) { m_geodeticHeight = height; }
 
+            //! Set height to NULL
+            void setGeodeticHeightToNull();
+
             //! Set normal vector
             void setNormalVector(const QVector3D &normal) { m_x = normal.x(); m_y = normal.y(); m_z = normal.z(); }