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diff --git a/apps/gps/nmealib/nmea/gmath.h b/apps/gps/nmealib/nmea/gmath.h
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+/*
+ *
+ * NMEA library
+ * URL: http://nmea.sourceforge.net
+ * Author: Tim (xtimor@gmail.com)
+ * Licence: http://www.gnu.org/licenses/lgpl.html
+ * $Id: gmath.h 17 2008-03-11 11:56:11Z xtimor $
+ *
+ */
+
+#ifndef __NMEA_GMATH_H__
+#define __NMEA_GMATH_H__
+
+#include "info.h"
+
+#define NMEA_PI                     (3.141592653589793)             /**< PI value */
+#define NMEA_PI180                  (NMEA_PI / 180)                 /**< PI division by 180 */
+#define NMEA_EARTHRADIUS_KM         (6378)                          /**< Earth's mean radius in km */
+#define NMEA_EARTHRADIUS_M          (NMEA_EARTHRADIUS_KM * 1000)    /**< Earth's mean radius in m */
+#define NMEA_EARTH_SEMIMAJORAXIS_M  (6378137.0)                     /**< Earth's semi-major axis in m according WGS84 */
+#define NMEA_EARTH_SEMIMAJORAXIS_KM (NMEA_EARTHMAJORAXIS_KM / 1000) /**< Earth's semi-major axis in km according WGS 84 */
+#define NMEA_EARTH_FLATTENING       (1 / 298.257223563)             /**< Earth's flattening according WGS 84 */
+#define NMEA_DOP_FACTOR             (5)                             /**< Factor for translating DOP to meters */
+
+#ifdef  __cplusplus
+extern "C" {
+#endif
+
+/*
+ * degree VS radian
+ */
+
+float nmea_degree2radian(float val);
+float nmea_radian2degree(float val);
+
+/*
+ * NDEG (NMEA degree)
+ */
+
+float nmea_ndeg2degree(float val);
+float nmea_degree2ndeg(float val);
+
+float nmea_ndeg2radian(float val);
+float nmea_radian2ndeg(float val);
+
+/*
+ * DOP
+ */
+
+float nmea_calc_pdop(float hdop, float vdop);
+float nmea_dop2meters(float dop);
+float nmea_meters2dop(float meters);
+
+/*
+ * positions work
+ */
+
+void nmea_info2pos(const nmeaINFO *info, nmeaPOS *pos);
+void nmea_pos2info(const nmeaPOS *pos, nmeaINFO *info);
+
+float  nmea_distance(
+        const nmeaPOS *from_pos,
+        const nmeaPOS *to_pos
+        );
+
+float  nmea_distance_ellipsoid(
+        const nmeaPOS *from_pos,
+        const nmeaPOS *to_pos,
+        float *from_azimuth,
+        float *to_azimuth
+        );
+
+int     nmea_move_horz(
+        const nmeaPOS *start_pos,
+        nmeaPOS *end_pos,
+        float azimuth,
+        float distance
+        );
+
+int     nmea_move_horz_ellipsoid(
+        const nmeaPOS *start_pos,
+        nmeaPOS *end_pos,
+        float azimuth,
+        float distance,
+        float *end_azimuth
+        );
+
+#ifdef  __cplusplus
+}
+#endif
+
+#endif /* __NMEA_GMATH_H__ */