private static float getDeltaForDistance(final float distance) {
        if (distance > 1.0) {
            return 0.2f;
        }
        if (distance > 0.05) {
            return distance / 5.0f;
        }
        return 0f;
    }
Return distance required to be moved based on overall distance.<br>

@param distance in km
@return delta in km
main/src/main/java/cgeo/geocaching/speech/SpeechService.java