A warning triangle, apex down containing the word ICE. directly above an ice class draught mark (called an ICE mark) at the maximum permissible ice class draught amidships.
The ICE mark is a horizontal line 230 mm long and 25 mm thick, marked 540 mm abaft the centre of the load line ring or 540 mm abaft the vertical line of the timber load line (if applicable), and has the word ICE immediately abaft it. The marks must be in reflective red or yellow. The warning triangle is to show the draught limitation to icebreaker masters and port inspection personnel.