caboolture;
You must be making the comment "tongue in cheek" magnets as you know will erase the memory chip
Was kind of hoping that the CSMU is using "flash" memory, i.e. electric field and not magnetic field to change data state. A permanent magnet shouldn't have any effect.
A low frequency tuned inductive loop could also be used for detecting a buried steel object. The oscillator frequency would "dip" if a ferrous object intersected its field. A bit like "treasure hunting".
