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diff --git a/apps/gps/nmealib/nmea/units.h b/apps/gps/nmealib/nmea/units.h
new file mode 100644
index 000000000..767f980e2
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+++ b/apps/gps/nmealib/nmea/units.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: units.h 4 2007-08-27 13:11:03Z xtimor $
+ *
+ */
+
+#ifndef __NMEA_UNITS_H__
+#define __NMEA_UNITS_H__
+
+#include "config.h"
+
+/*
+ * Distance units
+ */
+
+#define NMEA_TUD_YARDS      (1.0936)        /**< Yeards, meter * NMEA_TUD_YARDS = yard */
+#define NMEA_TUD_KNOTS      (1.852)         /**< Knots, kilometer / NMEA_TUD_KNOTS = knot */
+#define NMEA_TUD_MILES      (1.609)         /**< Miles, kilometer / NMEA_TUD_MILES = mile */
+
+/*
+ * Speed units
+ */
+
+#define NMEA_TUS_MS         (3.6)           /**< Meters per seconds, (k/h) / NMEA_TUS_MS= (m/s) */
+
+#endif /* __NMEA_UNITS_H__ */