This idea expresses trying to move forward while being
pushed back. It shows how Gatsby was never able to move on and was
always reminded of his past. It was on a boat where he changes his
name form James Gatz to Jay Gatsby. This shows how during this
turmoil of going against the current he tries to draw father away from
his past by creating a new person for himself.
During the luncheon at Daisy's with Gatsby, Tom, Nick, and Jordan,
they see wings of a boat moving against the "blue cool limit of the
sky". This is right while Gatsby shows his house
off. His house is another thing that represents that he is not the
person he was in the past. Show the boat at this time refers to
this as part of Gatsby's striving to forget about his origins and backgrounds
while there are always things reminding him of it.