New PD

[WM6]

Originally Posted by Geo

Okay, let's say that detects earth magnetism. When it detects a coin from any place and on any terrain , it is enough for me

Geo, problem is that such way it can detect only known coins, but our goal is to detect unknown treasure.

If your pistol return signal only in moving through a earth magnetic field, all unknown treasures remain unknown forever.

We need to do test properly with targets position unknown to pistol operator (and detecting angle cannot be 90° too).

90°detecting angle mean that treasure can be anywhere, but to establish that treasure can be anywhere you do not need PD, logical reasoning is enough.