Nice shot Phil.
The sign is actually what makes it work for me because of it's obviously industrial form against the sky and that very maritime green colour against the sky blue.
I grew up in a coastal town with a heavily industrialised river. It obviously imprinted me aesthetically; I'm fascinated by the interaction ( collision? ) of the elemental force of the sea & the colours & utilitarian form of sea going craft, buoys, cranes etc.
Your picture captures that interaction for me.