What does the purple button do

Hint 1 of 4:

Read it. It says "Go With the Flow."

Hint 2 of 4:

Now push it. Notice what it says, "Full Speed Ahead."

Hint 3 of 4:

If "Full Speed" is on, you'll go faster.

Hint 4 of 4:

But if "Go With the Flow" is on, you'll be carried by the currents.