Code of Federal Regulations Title 33. Navigation and Navigable Waters § 33.150.320 What advisories are given to tankers?

(a) At intervals not exceeding 10 minutes, the vessel's position by range and bearing from the pumping platform complex;  and

(b) The position and the estimated course and speed, if moving, of all other vessels that may interfere with the movement of the tanker within the safety zone or area to be avoided.