/// <summary>
 /// pan/tilt control for gun only
 /// </summary>
 /// <param name="panDegreesFromCenter"></param>
 /// <param name="tiltDegreesFromCenter"></param>
 private void setGunPanTilt(double panDegreesFromCenter, double tiltDegreesFromCenter)
 {
     GunTurretLeft.SetPanTilt(panDegreesFromCenter, tiltDegreesFromCenter);
     GunTurretRight.SetPanTilt(panDegreesFromCenter, tiltDegreesFromCenter);
 }