PHASE 1: INITIAL DETECTION 



From the box entry point, the 



radar was used to search for a 



target in its anticipated 



position. Target density noted 



during the transit was minimal, 



with fewer than 12 boats 



detected and visually 



identified. There were no boats 



within 30 nm of the iceberg 



target. The suspected iceberg 



target was detected at 50.9 nm 



with the 80 nm range setting. 



The radar display was zoomed 



to the position and the target 



was further analyzed. Positive 



target identification did not 



occur until it was seen from the 



flight deck at 25 nm. Once 



detected and identified, the 



aircraft descended to estimate 



the on-scene environmental 



conditions and fully document 



the physical characteristics of the iceberg. Additionally, the time and position of the iceberg were 



marked. Once back at patrol altitude, Phase 2 commenced. Note that all subsequent iceberg 



searches are for a known target and position. 



Figure 4. Results of the patrol. Leg numbers are indicated above (2,4, 

 and 7 were left off the plot for ease of viewing). The inset shows the 

 change in iceberg position throughout the experiment. For perspective, 

 the distance between iceberg positions is approximately one nautical 

 mile. 



Figure 5. Photograph of the iceberg detected during this experiment. 

 Note the dry-dock shape and the wake caused by the wash/back-wash 

 of the swell. 



Environmental Conditions 



• Wind: light (12 kn) from 

 the east (100°T) 



• Sea State: calm (1 m 

 swell) with no 

 disccrnablc wind waves 



• Visibility: unrestricted at 

 the surface and from 

 patrol altitude to surface 



Iceberg Description 



• Shape: dry dock (Figure 

 5). The iceberg was 

 typical of dry-dock 

 icebergs with two side 

 walls separated by a split 

 that extends below the 

 water surface. Neither 



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