Anyone know what this is?

Can you help me Hive Mind?

I saw this today at Shoeburyness Sea Front, England. I’ve taken a photo to add it to Google maps but I don’t know what it actually is. I’m guessing it’s something to do with the seaside footpath being safe or something for showing wind strength. Hell, could be a modern art installation for all I know.

Larger version of photo and location details can be found here:
http://www.panoramio.com/photo/55767787

the rocks are very bad for boats

REGULATORY MARKS - … The shape determines what type of mark it is.

An open diamond shape signifies danger.

Thanks Oddball, I think that’s it!