SnMap raster chart offer is derived from data provided by the SHOM, I.I.M. (Italian HO) and UKHO. Charts are updated once to twice a year. Although the look is similar, they are not scanned from paper charts, but issued from the printing films, which eliminates manipulation errors, and facilitates regular updates.
The raster charts will be protected on your Adrena dongle; thus you can install and display them on each computer that you use.