They don't expect that it is Rev. Moon. Father can walk around barefoot and in shorts to avoid attention. So if Father is alone, he is internally free. As Father looks at the tip of the fishing pole, he meditates on the will of God. He absorbs all the issues and meditates.
Fishing is a high level virtue in the orient.
That is why Father prefers a small boat. He feels alone in the universe, just as you can easily contact satellites. You can think of God's providence, everything, how wonderful it is. Father starts dancing in his mind. It's not just fishing.