What is the central idea of "A Cub Pilot" by Mark Twain?

A baby bear is taken on a boat. The narrator takes care of him, and teaches him how to know the rivers and channels of the water.

The narrator is a new pilot, and is nervous about his first trip. He doesn't believe in himself, and only with the help of his chief, does he realize that he knew everything all along.

The narrator is a pilot of a boat and learnes through his hardships how to build the perfect memory.

The narrator values knowledge over everything. He pilots a boat and allows his chief to challenge his knowledge, and in turn makes him panic. He then realizes that he has to be confident and trust his memory.​