the radar display is visible through the HUD and marks a target's actual position on earth. For 

 example, when a radar operator places the cursor on a target, the cursor on the HUD functions 

 somewhat as a cross hair, directing the pilot's vision to the target's position. 



Figure 2. Display 2 (left) and 3 (right) on the flight deck of CG2006. Note 

 the radar depiction on display 2 and the digital map on display 3. While 

 difficult to see in the image above, the cursor ("+") on the radar and map are 

 connected, so that cursor movement on the radar screen translates into 

 movement on the map. 



Experiment Design and 

 Results 



The experiment consisted 

 of three phases: (1) initial 

 detection, (2) north-south 

 expanding parallel search, 

 (3) east- west expanding 

 parallel search. Each phase 

 is described below. To 

 minimize the number of 

 variables involved, patrol 

 criteria were kept as similar 

 to normal Ice Patrol HC- 

 130H operations as 

 possible, that is, 250 knots 

 indicated air speed at 7,000 

 feet. 



GENERAL 



Based on an iceberg's forecasted 

 position, which had been detected and 

 identified two days earlier, a box flight 

 plan (5,500 to 8,000 feet) was filed for 

 the experiment (Figure 3). Crew 

 positions included a Radar Ice Observer 

 (RIO) on the flight deck and an Ice 

 Observer at each of the paratroop-door 

 windows. The RIO was provided 

 limited training on the use of the APN- 

 241 and was able to operate the system 

 on a very limited basis. For most of the 

 patrol, in fact, the pilots operated the 

 radar. Figure 4 displays the flight track, 

 and Table 1 summarizes the detection 

 results of Phases 2 and 3. Based on the 

 pilots' recommendation, the radar was 

 set in MGM mode for the duration of 

 the patrol. Antenna gain and antenna tilt 

 were adjusted during the patrol to 

 maximize radar performance. 



Figure 3. Flight planning used for the experiment. The corner 

 positions indicate the limits of the boxed flight plan filed with 

 the Flight Service Center and Air Traffic Center. 



56 



