What does the phrase "off the boat" mean?

[Hoamuahe]

English Language Tests, Intermediate level

ESL/EFL Test #737 "Boat/Sailing Common Phrases (1)", question 8

I have lived here for more than 10 years. What do you think that I'm just off the ......... or something?! I'm not nave because I'm not a newcomer. In fact, I'm an American citizen now!

(a) ship
(b) boat
(c) plank
(d) sail

English Language Tests, Intermediate level

ESL/EFL Test #737 "Boat/Sailing Common Phrases (1)", answer 8

I have lived here for more than 10 years. What do you think that I'm just off the boat or something?! I'm not nave because I'm not a newcomer. In fact, I'm an American citizen now!

Correct answer: (b) boat
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what does the phrase "off the boat" mean?
In the sentence above,the word nave or naive means innocent in the context?

[Alan]

Hi,

'Just off the boat' describes someone who is a newcomer - someone who has just arrived.

Alan
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English as a Second Language
You can read my ESL story Only Three Letters