Very well said, UncleBob!
This looks like an introductory.
I don't think it is C-Map, it certainly doesn't look like C-Map, more likely a pirate enterprise and IT IS imo NEXT TO USELESS AND DANGEROUS FOR PROPER NAVIGATION !
Be warned, it is a shoddily compiled vector chart, rubbish as it is!
C-Map, which l used in my chart plotter for years, is a WGS84 based RNC, the electronic version of the AHC's paper charts, produced by a well respected chart company called Jeppesens.
This EMBARK thing is nothing like it.
The official RNC is available from Jeppesens (C-Map) or MemoryMap, the later for $50
US and it is for life.