46 C.F.R. § 45.37 Salt water load lines.
Title 46 - Shipping
Each vessel that operates in the salt water of the St. Lawrence River must— (a) Be marked with the summer (S), midsummer (MS), intermediate (I) and winter (W) load line marks under §45.77 for salt water; and (b) Be marked with the letters “FW” above the fresh water marks and the letters “SW” above the salt water marks as described in figure 2.
Title 46: Shipping
PART 45—GREAT LAKES LOAD LINES
Subpart B—Load Line Marks
§ 45.37 Salt water load lines.
