33 CFR § 157.136 Rules for the Protection of the Marine Environment Relating to Tank Vessels Carrying Oil in Bulk§ 157.136 Two-way voice communications.Current through Sep 9, 2026 · Read all of Part 157Each tank vessel having a COW system under § 157.10(e), § 157.10a(a)(2), or § 157.10c(b)(2) must have a means that enables two-way voice communications between the main deck watch required under § 157.168 and each cargo discharge control station. [CGD 82-28, 50 FR 11628, Mar. 22, 1985]