
The U.S. Coast Guard leads the International Ice Patrol. It was established in the aftermath of the 1912 Titanic disaster to track ice hazards in the North Atlantic in the area of the Grand Banks of Newfoundland. The patrol initially fell under the auspices of the Revenue Cutter Service, the Coast Guard's predecessor. The North Atlantic ice season runs from Feb. 1 to July 31. Thirteen countries fund the patrol.
Photos: U.S. Coast Guard

In the 21st century, the International Ice Patrol relies primarily on aircraft. The "mainstay" has been the C-130 family since 1962, according to the Coast Guard. Today, the patrol's HC-130Js operate out of Elizabeth City, North Carolina. Flights last five to seven hours and cover 30,000 square miles. Air crews go out an average of five days every other week during ice season. Data are gathered to predict iceberg drift.

Seneca and Miami were the first revenue cutters to chart the North Atlantic icefields. This is a photo of Seneca on the prowl in 1914. The cutters sent ice reports by radio. The patrol stood down during both World Wars when German U-boats hunted Allied shipping. To be considered an iceberg, a free-floating, frozen chunk of glacial freshwater must measure at least 15 meters (or 16.4 yards) in length. Smaller chunks are called growlers - and they too can punch a hole in a hull.
In March 1957, the U.S. Coast Guard icebreaker Eastwind (WAGB-279) photographed the tallest known iceberg in the North Atlantic at that time. It extended 500 feet above surface - almost the height of the Washington Monument. It was located in Melville Bay, Greenland, position 75N, 67-30W.
View of cutter Eastwind through "eye" of an iceberg in Baffin Bay in September 1952 during an Arctic trek. Here's a knowledge nugget from Science Daily: "Since the density of pure water ice is ca. 920 kg/m3, and that of sea water ca. 1025 kg/m3, typically, around 90% of the volume of an iceberg is under water, and that portion's shape can be difficult to surmise from looking at what is visible above the surface."
This is believed to be the iceberg that sank the Titanic - pockmarked by a patch of paint that may have rubbed off the doomed liner's ruptured hull. It was photographed hours after the Titanic foundered on April 15, 1912 from the German ocean liner SS Prinz Adalbert. The actual collision occurred late on April 14. On the anniversary of the Titanic disaster, the Ice Patrol drops flowers over the presumed site.

On ice patrol duty in 1951, U.S. Coast Guard cutter Evergreen (WAGL-295 / WLB-295 / WAGO-295 / WMEC-295), rides the waves. The seagoing buoy tender featured a reinforced hull for light ice-breaking duty.
- Vinny Del Giudice, U.S. Coast Guard Auxiliary