public static float convertSpeedUnitIndexToFactor(int index) {
        switch (index) {
            case 0:
                return KPH;
            case 1:
                return MPH;
            case 2:
                return MPS; 
            case 3:
                return KN;
            case 4:
                return KN;
            default:
                return KPH;
        }
    }