work (i.e., low magnetic signatures and detection of nonferrous materials). In addition, these 

 systems typically require specialized training and diving equipment that is not readily available 

 to the UCTs. 



To provide a suitable system for UCT use, an investigation of specific UCT requirements 

 and an evaluation of both military and commercially available systems were performed. 

 Appendix A lists the Test and Evaluation Master Plan (TEMP) thresholds for the BP&CL. 



To identify candidate metal detecting systems and technologies suitable for UCT use, a 

 literature survey of metal detecting systems was performed by NCEL. This survey, documented 

 in Reference 1 , encompassed both active and passive military and commercially available systems 

 and identified several promising candidate systems that appeared to be suitable for UCT use. 

 These systems were: 



• Navy MK-10 



• Garrett XL500 



• Fisher Pulse 10 



• Fisher Pulse 8 



• White's PI- 1000 



• Forster Ferex 4.021 



Figure 1 shows the family of metal detecting systems. 



The MK-10 is a portable diver-held fluxgate magnetometer designed as an ordnance 

 locator. It has been in service since the early 1960s. However, the Navy EOD community has 

 experienced extreme difficulties in keeping sufficient units operating (Ref 2) and is in the process 

 of phasing this system out. 



The Garrett, Fisher, and White's units are commercially available pulse-induced systems. 

 With the exception of the Fisher Pulse 10, these systems were developed primarily for the 

 treasure or sport diver. The Pulse 10 is a boat-towed system. 



The Forster Ferex 4.021 is a magnetometer designed for terrestrial use. UCT-ONE has 

 used this system with some limited success to locate a 12,000-pound anchor at the Naval 

 Weapons Station, Earle, New Jersey. It was reported (Ref 3) that one of three buried anchors 

 was located using this system. However, only the probe can be submerged. The power and 

 control modules are not submersible. 



To determine the suitability of these systems for UCT use, tests and evaluations of these 

 systems were performed at NCEL. The results of this evaluation are provided in the next section 

 of this report. Advanced Development Model (ADM) System. Based on the results of the ADM 

 testing, the Forster Ferex magnetometer was modified to provide enhanced performance for UCT 

 use. This development is documented in the Engineering Development Model (EDM) System 

 section of this report. 



