Code of Federal Regulations Title 33. Navigation and Navigable Waters § 33.401.84 Reporting of impairment or other hazard by vessels transiting within the Seaway

(a) Any condition of the vessel that might impair its ability to transit safely and expeditiously;

(b) Any hazardous condition of the vessel;

(c) Any malfunction of equipment on the vessel

(d) Any difficulty on the part of the vessel in controlling its tow or tows;

(e) Any hazard, dangerous situation or malfunctioning aid to navigation which has not been published in a Notice to Mariners;

(f) Any loss of anchor with particulars of the precise location of the loss;  and

(g) Any location where visibility is less than one nautical mile.