Isn't it about time for Mapmedia to issue a new set of S57/NOAA charts? As best I can tell, the charts now available (inside ...MAP18.DBV) are mostly more than 2 years old. Maybe you could give them a nudge?
MapMedia is still the place to go to ask that question. Typically they release updates in the MM3 format once a year. The new ones should be out soon, if not out already...
As far as when v18 MM3 version NOAA vector released; I show they released on Sep 16th 2021 so that means the next FREE update will be roughly Sep 2022.