And it is hardly practical to go back and ask the Laestrygonians for directions before they have had dinner.
So the captain is searching for another island with friendlier inhabitants.
In the mean time, use to the resource below to tell who Poseidon is and why he is angry at Odysseus. Also, who did Poseidon contest with for Athens?
Resource One:
http://www.mythweb.com/gods/Poseidon.html