Norman...
oeSENC charts are vector charts and in the case of Italy the source is the Italian Hydrographic Office of the Italian
Marine.
The oeSENC set contains the complete portfolio as issued by this body. Both coast of Italy including all islands.
There are weekly updates.
The content is identical to "official charts" but for
legal reasons oeSENC charts can't be called "official" in the sense of carriage requirements.
The Imray chart sets are raster charts, requiring the oeRNC plug-in. The oeRNC is not yet available for Android, but this will change in the next weeks.
If you are using the Imray
cruising guides you will will get a perfect match with charts on the plotter for planning or
navigation.
The Imray Adria/Ionian Sea covers as well the Eastern
Adriatic coast and the Western part of the Penepoles (Greece).
Imray sets get updated quarterly. Expect edition 2019-Q4 end of next week.
The original sources for the Imray charts are the official paper charts as issued by Italy,
Croatia,
Greece and UKHO for this region. Some
marinas are covered by private sources.
The Eastern part of the Adria is also covered by the oeSENC set
Croatia.
For
Greece the only available charts at o-charts are the Imray sets.
The oeSENC sets contain slightly more charts in both cases of Italy (Adria) and Croatia.
Neither of the sets will be perfect, the official S-57 charts do not cover each of the smaller
marinas. Different from country to country as well.
Spain for example is including more and more marinas into their portfolio.
Hope that helps...
Hubert