Recently along the far southeastern Turkish coast we encountered a navigational marker that was new to us.
It was a large cone shape painted red over green, with a 1-meter circular base painted black. Sticking up over a meter above this red & green cone were 2 black circles, placed about 1/2 meter apart, 1 directly aligned over the other.
Can anyone tell me what this marker means? I cannot find it in any of my reference books