It shows the shock of the character.
That would be one point, not to sure about any others though.
Answer: The poem compares a book to a ship. frigate, is a warship.
Explanation:
Hmm... OK, I read the poem and here's what Ive got.
It seems like there is some type of travel and also its the only form of transport that was given.
Try that.
D. Nick Carraway is the answer i believe