33 CFR § 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.