What can be called an officer?

You can be an officer if you have three certificates.

Those who have three certificates (white paper/big certificate) are not official officers, because there is still 12 months internship.

Sailors are not officers, but sailors/mechanics are ordinary crew members.

In addition to the certificate of the third mate/ship, there is also a crew service book and crew certificate (there are at least four decals in it, and the other decals are oil tankers and chemical tankers).

What are Ba and Li cards? I haven't heard of it. Do you run the ocean?

The certificate of third mate/third boat means that you have the ability to be an officer, but it doesn't necessarily mean that you are allowed to be an officer. The senior crew is the crew of three or more crew members on board. Since he has been on board as an officer, there is no problem of missing any certificates.

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