All vessels that are: a. of 500 tons gross tonnage or more

Original warning text

                        TO ENTERING CANADIAN WATERS.
1. ALL VESSELS THAT ARE:
   A. OF 500 TONS GROSS TONNAGE OR MORE.
   B. ENGAGED IN TOWING OR PUSHING A VESSEL, WHERE THE
      COMBINED TONNAGE OF THE SHIP AND VESSEL BEING TOWED
      OR PUSHED IS 500 GROSS TONS TONNAGE OR MORE.
   C. CARRYING A POLLUTANT OR DANGEROUS GOODS, ENGAGED
      IN TOWING OR PUSHING A VESSEL CARRYING A
      POLLUTANT OR DANGEROUS GOODS.
2. MUST REQUEST CLEARANCE 96 HOURS PRIOR TO ENTERING
   CANADIAN WATERS FROM SEAWARD OR AS SOON AS PRACTICAL
   WHERE THE ESTIMATED TIME OF ARRIVAL OF THE SHIP IN
   CANADIAN WATERS IS LESS THAN 96 HOURS AFTER THE TIME
   THE SHIP DEPARTED ITS LAST PORT OF CALL.
3. CANCEL NAVAREA IV 393/01 AND 219/02.