ENC charts (S57/S63) are digital nautical charts generally used by professionals on ECDIS or computers with SeaPro type software. Professionals seem to be abandoning raster nautical charts in favor of ENCs.
ENC charts are published by all hydrographic services around the world: Shom, Admiralty, etc.
The coverage areas coming from several Hydrographic Services (Shom, Admiralty, Japan, South Africa, Brazil, etc.) and each publisher applying its own price, we need to know the map(s) you want.
Duration: on certain ECDIS, the cards may no longer be usable when the subscription period expires.