Chain bird feeder?

At the Marina, in a few places, are small Islands kept dog free and ideal for the nesting birds. On one of them is this unique chain man to which has been added two bird feeders. If there is nowhere else to hang them it might as well be on this.
 In the background are the Classic Shakespeare hire fleet. As our boat is moored directly opposite them I have watched them coming and going with some amusement. One thing I have noticed is that the staff moving the boats seem to have little or no respect to us berth holders. Its either dead slow or flat out with nothing in between. I just wonder if when the hirer's come to take them out, they are told to slow down passed moored boats. I think not!!!!