Sailors are sailing...
It's showing people sailing past it. It's clearly marked with 8 yellow buoys and two of the Montgomery's masts sticking out of the water. The Montgomery's a favourite place for people to do a day trip from Chatham, Gillingham, Rochester etc. as a little trip out into the Thames Estuary.
The people to the south of the Montgomery, on The Isle of Sheppy, are either the webbed-feet locals or people sailing dinghies/jetskis.
Biting the hand that feeds IT
