+ public int course() { return data8(17); }
+ public int ground_speed() { return data16(18); }
+ public int climb_rate() { return data16(20); }
+ public int pdop() { return data8(22); }
+ public int hdop() { return data8(23); }
+ public int vdop() { return data8(24); }
+ public int mode() { return data8(25); }
+