gps: Report speed in meters per second

Signed-off-by: Paul Kocialkowski <contact@paulk.fr>

1 files changed, 5 insertions, 1 deletions

diff --git a/gps/nmea.c b/gps/nmea.c
index b8d6338..a2a5059 100644
--- a/gps/nmea.c
+++ b/gps/nmea.c
@@ -510,9 +510,13 @@ int gta04_gps_nmea_gprmc(char *nmea)
 	gta04_gps_nmea_coordinates(nmea);
 
 	buffer = gta04_gps_nmea_parse(nmea);
-	if (buffer != NULL)
+	if (buffer != NULL) {
 		speed = gta04_gps_nmea_parse_float(buffer, 0, strlen(buffer));
 
+		// Convert knots (nautical miles per hour) to meters per second
+		speed = speed * 1.852f / 3.6f;
+	}
+
 	buffer = gta04_gps_nmea_parse(nmea);
 	if (buffer != NULL)
 		bearing = gta04_gps_nmea_parse_float(buffer, 0, strlen(buffer));