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It is a control buoy- indicates speed limits, no-wake zones, etc
This is a non-lateral marker. It can indicate a controlled area, such as no wake. It can be an informational marker, a "keep out" marker, or a warning marker (Dam, Rock, etc)
This sign indicates a controlled area where a boater must proceed at a speed no greater than that which will maintain steerage and headway.
you put a marker called a diploma marker.
keep out of that area
A circle marker is a symbol on a regulatory marker that is used to mark a no wake or idle speed area.
There are scuba diving classes and popular scuba diving areas in Sydney, Australia. Scuba diving clubs are not advertised in that area.
a marshal (an official)
keep out of that area
One could purchase a diving helmet in the Poole area by using the A Simpler Time website. Through the website one can purchase a diving helmet and get it sent to Poole.
Competitive diving is when an athlete participates in competitions in the area of springboard diving. There is spring board diving, which is done on either a one meter or a three meter diving board. Then, there is platform diving, which is most commonly done on a five meter, seven meter and ten meter. Diving is a competitive sport practiced in the Olympics, where they do both springboard and platform diving.
none that i know of. the u.s. navy probably does technical diving in the area