[GPSNavX]

Depending on the whims of the US Congress, the funding of the conversion to ENC flows and ebbs, but in general NOAA is slowly moving all the RNC data to ENC format. So in general it is good to get a fresh download of the ENC charts from NOAA every month or so. Until the conversion is complete, NOAA RNCs can be used to supplement the NOAA ENCs.

Chartworld does offer updates of their international ENCs during the subscription interval and customers are notified via email of updates that can be downloaded.