Discloth pattern for baby blanket

I want to take this dishcloth pattern http://www.knittingknonsense.com/sailboatcloth.html and make it into a baby blanket. Could anyone tell me how to do the math to accomplish it? I attempted once, but apparently my math was wrong. :doh: Is there a simple calculation for something like this? Thanks!

[color=indigo]Do you want a huge sail boat? Or a series of repeats in each row? Or just one in the center?[/color]

I’d like just one sailboat in the middle of the blanket.