Solas Chapter V Regulation 31 requires that the Master of any ship that meets with ‘… Dangerous Ice …’ shall report it to …
- Ships in the vicinity
- The appropriate authority
However we have to know what ‘Dangerous Ice’ is. If you spend most of your time cruising in warm climates it is worth reviewing this section before orals.
Types of Ice
- Salt water sea ice
- Fresh water sea ice
- Iceberg (North and South Hemisphere)
SW sea ice
Salt water sea ice is found when air temperature is less than freezing and the sea water temperature is less than -1.3ºC. Thermal maps of the sea are useful along with taking sea water temperatures.
North Atlantic passages bring the dangers of ice accretion between November and February and of Iceberg between February and July.
North Hemisphere Icebergs are formed at Glacier edges and calve at a rate of 15m a day. They can take three years before they get into sea lanes off the Grand Banks.
- Close all watertight doors.
- Ensure the ship’s damage control equipment is ready.
- Engine room warned, engines ready for immediate manoeuvre.
- Proceed at a moderate speed at night.
- Have the boats ready for lowering.
- Post extra lookouts (crow’s nest, bow, bridge wings).
- Keep a continuous radar watch.
- Listen-in to Ice Patrol bulletins, obtain the latest weather and ice faxes
- Radar scanner heaters on.
- Winter-grade lubricants on lifeboat fails, rigging, etc.
- Anti-freeze in all boat engines.
- Drain the deck fire main.
- Report any ice sightings or ice accretion.
- Rig lifelines on deck, place sand on decks and slippery surfaces.
- Maintain adequate stability