coverage obtained per system (i.e., video camera track lines, X-star track lines, 

 and magnetometer track lines) is illustrated in Figures 4-7. 



Inert Ordnance Test Bed 



An ordnance calibration and test field was temporarily installed in a protected 

 cove adjacent to the Sandy Hook Coast Guard (CG) Station (near CG dock shown 

 on Figure 2). A jet pump was used during low tide to bury (approximately 0.7 m 

 below the sand surface) a cluster of several pieces of inert ordnance. This created 

 a buried target approximately 0.5 by 0.5 m 2 . In addition, nine pieces of inert 

 ordnance of various calibers (generally ranging from 75 mm to 105 mm, 

 including a 155-mm piece) were placed 3 m apart in a line parallel to shore at a 

 location where approximately 2 to 2.3 m of water would exist during high tide. 

 The single inert ordnance piece closest to the cluster was buried approximately 

 0.3 m below the sand surface. Each ordnance target was marked with a witness 

 buoy. Prior to the installation of the ordnance test bed, the area had been "swept" 

 with a hand-held magnetometer to confirm that no other ferrous metal objects 

 were present. There were, however, a number of pieces of wood and stone in the 

 test bed area. The magnetic gradiometer and the X-star were towed over this test 

 bed several times during high tide in an attempt to evaluate the performance of 

 these two instruments in a controlled test. After completion of these tests, the 

 inert ordnance was removed and the site was returned to its pretest condition. 



12 



Chapter 3 Pilot Study Overview 



