Originally Posted by garrobito
It's possible to use navionic or any other maps other than raster type with open cpn
OCPN deals with vector charts
in the S57 format (S63 is the same but encrypted) and the CM93 format.
Please have look here:
All About Charts | Official OpenCPN Homepage
from a file or SD card "as is" you can't use - this is a private, special, non-open format like C-MAP
Depending on the region you would like to use there are - free is the exception for US waters - vector charts in the S57/S63 format which can be licensed.
And there are raster charts for several regions as well.
There are as well plug-ins for various commercial
formats - just have a look at the documentation