diff --git a/src/lib/lat_lon_alt/lat_lon_alt.hpp b/src/lib/lat_lon_alt/lat_lon_alt.hpp
index 085143c6f9..02614c1862 100644
--- a/src/lib/lat_lon_alt/lat_lon_alt.hpp
+++ b/src/lib/lat_lon_alt/lat_lon_alt.hpp
@@ -98,6 +98,14 @@ public:
 	 */
 	matrix::Vector3f computeAngularRateNavFrame(const matrix::Vector3f &v_ned) const;
 
+	struct Wgs84 {
+		static constexpr double equatorial_radius = 6378137.0;
+		static constexpr double eccentricity = 0.0818191908425;
+		static constexpr double eccentricity2 = eccentricity * eccentricity;
+		static constexpr double meridian_radius_of_curvature_numerator = equatorial_radius * (1.0 - eccentricity2);
+		static constexpr double gravity_equator = 9.7803253359;
+	};
+
 private:
 	// Convert between curvilinear and cartesian errors
 	static matrix::Vector2d deltaLatLonToDeltaXY(const double latitude, const float altitude);
@@ -105,13 +113,6 @@ private:
 	static void computeRadiiOfCurvature(const double latitude, double &meridian_radius_of_curvature,
 					    double &transverse_radius_of_curvature);
 
-	struct Wgs84 {
-		static constexpr double equatorial_radius = 6378137.0;
-		static constexpr double eccentricity = 0.0818191908425;
-		static constexpr double eccentricity2 = eccentricity * eccentricity;
-		static constexpr double meridian_radius_of_curvature_numerator = equatorial_radius * (1.0 - eccentricity2);
-	};
-
 	double _latitude_rad{0.0};
 	double _longitude_rad{0.0};
 	float _altitude{0.0};