You can buy the smaller areas too. My experience is the quality is very good. Better then Navionics
, but its hard to evaluate the "quality" of an E-chart , you probably dont find out till youre on that unmarked reef.
The main thing I found is that marina layouts had changed, but all th e coastal and offshore
stuff was current
We had Raymarine gear
on a trip from France
, Sardinia, Scily, heal of Italy
recently, this was Navionics and it was fine too. I still prefer the Garmin charts.
When I was in Croatia
three years ago , I had my trusty Garmin 276C plotter and the boat had raymarin, with navionics. my garmin charts missed some of the new marinas
, but Navionics left out underwater features ( ok that dont affect small boats), but I prefer to see all teh features.
Thats my tuppence.