A Document of Compliance (DOC) depends on the type of your ship and varies for each different kind of vessel. If the ship is newly added, an interim DOC is issued by the authorities, and the type of DOC is changed with time and audit results.
An SMC on the other hand is a Safety Management Certificate issued to the vessel in cases where the DOC has already been obtained. These both form the most important part of a ship’s documentation SOPs (Standard Operating Procedures).