I started using navigraph because the default navigation data was horrible. If you approach to almost all of the Chinese airports like Shanghail, Beijing, etc. All the ILS runways navaids are not inline with the runway. Even though the real life charts doesn’t suggest they are an offset localiser.
As soon as I install the navigraph mod, it fixes these navaids to have properly lined up with the runways.
It also gives an added benefit that once the ILS signal is detected by the aircraft. The ND will show which ILS category it is. the default nav doesn’t do that.
It’s a paid subscription, but I think it’s worth it because you get the charts as well.