> Then you've also got the sonar nets that girdle the
>US. Anything that is metallic and is below the surface gets tracked when
>it comes within a certain range.
Actually Mike, the SOSA system to which you refer is a passive system. It is only able to track things that make noise regardless of the chemical makeup. Active sonar, where being metal really makes a difference is in itself detectable, due to the fact that it must send out the sound signal (ping) and wait for the reflection. Now a magnetic detection system, which SOSA is not, would function as described in your above paragraph.
ex Ping Jockey
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This archive was generated by hypermail 2b29 : Thu Jul 27 2000 - 14:13:17 MDT