Summary 



From 23 March to 7 September 

 1984, the International Ice Patrol 

 (IIP), a unit of the U.S. Coast 

 Guard, conducted the 

 International Ice Patrol Service, 

 which has been provided 

 annually since the sinking of the 

 RMS TITANIC on April 15, 1912. 

 During past years. Coast Guard 

 ships and/or aircraft have 

 patrolled the shipping lanes off 

 Newfoundland within the area 

 delineated by 40ON - 520N, 390W - 

 57°W, detecting icebergs and 

 warning mariners of these 

 hazards. During the 1984 Ice 

 Patrol season. Coast Guard HC- 

 1 30 aircraft deployed out of 

 Gander, Newfoundland to search 

 for icebergs in the Grand Banks 

 region of the North Atlantic. 

 These aircraft flew 78 ice 

 reconnaissance sorties, logging 

 over 476 flight hours. New 

 detection equipment, the 

 AN/APS-135 Side-Looking 

 Airborne Radar (SLAR), was 

 introduced into Ice Patrol duty 

 during the 1983 season. It 

 proved to be an excellent tool for 

 the detection of both icebergs 

 and sea ice, and alone provided 

 78 percent of the 1984 sightings 

 on IIP reconnaisance flights. A 

 total of 2202 icebergs were 

 estimated south of 48°N latitude, 

 a new record. The record number 

 of icebergs south of 48°N this 

 year was the result of colder than 

 normal conditions (see 

 Environmental Conditions 

 section) and increased iceberg 

 detection due to the use of SLAR 

 (see Appendix C). To evaluate 

 the iceberg drift and deterioration 

 models used by International Ice 



Patrol, an oceanographic cruise 

 was conducted by USCGC 

 HORNBEAM. This cruise 

 conducted the first hydrographic 

 survey since 1978, and included 

 drift and deterioration studies on 

 a medium iceberg (see Appendix 

 B). 



