@NonNull
    private static Geopoint[] defaultTrack(final Geopoint start, final Geopoint destination) {
        return new Geopoint[]{start, destination};
    }
Return a valid track (with at least two points, including the start and destination).
no caching

@param start       the starting point
@param destination the destination point
@param elevation   the variable to write elevation info to (null, if no elevation info to be returned)
@return a track with at least two points including the start and destination points
main/src/main/java/cgeo/geocaching/maps/routing/Routing.java