directENC is a proprietary format of Chartworld. Not for OCPN.
As far as we know, the Navionics
chart sets from Chartworld are coming in plain S-63 format. The base chart material is from Navionics and Chartworld licenses these charts
in the S-63 format for users who do not require official charts.
Update period is twice a year.
We know about scenarios where these chart sets are composed by numerous very small rectangular cells. Not all chart sets but those for Bahamas
or some Pacific regions we have seen.
OCPN struggles today if there are too many vector charts open at a time.
This will change in the future, but should be considered when going for the Navionics sets.