A Surprise Visitor Part Whatever

 The next ship was definitely a surprise.

As I was watching the Puna go down river, I saw another ship moving.

At first I wasn't sure if it was a Coast Guard cutter or the Iver Bright.

But then I looked at the bridge and realized that it was a cutter.

Turns out that it was the Mackinaw.

I think she was doing aids to navigation.