nautical mile visibility (37.5 km) and calm 

 seas. The icebergs observed in the 

 reconnaissance effort (Table 2) were 

 numbered based upon the frame number 

 of the film from which the photographs 

 were developed. Although our primary 

 effort was to correlate observed icebergs 

 with their corresponding RADARSAT- 

 detected targets, a number of vessels were 

 observed in and around the footprint area 

 at the time of the reconnaissance. Despite 

 having photographs of many of the vessels 

 during our reconnaissance, correlating 

 them to RADARSAT targets was 

 difficult because of the approximately 

 one- to five-hour time differential 

 between SAR detection and aerial 

 detection, and the lack of access to 

 their positions/tracks during the 

 intervening period. 



Results 



the OMW data with the visual 

 underflight data yielded the results in 

 Table 3. The observed positions of 

 icebergs and detected target positions 

 were within 2 nautical miles (3.7 km) 

 except for Iceberg 14/Target J, which 

 was over twice that distance. Expected 



error for the Inertial Navigation System 

 (INS) on CG-1503 is on the order of 2-3 

 nautical miles (approximately 4 km), but 

 can be as high as 10 nautical miles (18 

 km). It should also be noted that the 

 position of each visually observed iceberg 

 is based on a subjective determination of 

 distance from the aircraft track. This 

 estimation can vary from observer to 

 observer. 



Observed Iceberg #1 and the 

 growler(s) at 50°11'N, 51°23'W were 



59 



