In the poem "Sea Fever" by John Masefield, where do you hear variations in the meter?

Part of the success of this excellent poem is the way that
the author uses meter to enact the sound and the rhythm and the feel of the waves as
they lap against the boat of the speaker's imagination. Of course, the meter varies
tremendously as you go through the poem, with the iambic pentameter at times changing to
spondees that give these lines a definitely different feel. Consider the following
example:

And
the wheel's kick and the wind's song and the white sail's
shaking...

The spondee of
"wheel's kick" and "wind's song" and "white sail's" help to enact the sound of the waves
of the sea hitting the side of the boat and the rhythm of the water. This is a technique
that is used not just once in the poem, but in other lines. Now that I have identified
this example try to scan lines 7 and 11 to analyse the use of spondees by the author.
You might want to think about how dactyls are used as well. Good
luck!