Skip to 2 minutes if you like.

 

Thanks. That is the concept, sweeping very wide paths instead of ridiculous points that could take 1000+ the time.
I would like to know why that search coil is set to 'glide' like 50cm above soil instead of just dragged directly on top of soil.

 

I looked for a web site from a guy that was on ETO and made many different metal detectors and coils, Gary Chemelec. He died earlier this year and it looks like his website is no longer on line. But in doing that I found another link that has quite a bit of information that might be worth looking at - https://www.geotech1.com/cgi-bin/pages/common/index.pl?page=metdet&file=projects.dat

 

I would like to know why that search coil is set to 'glide' like 50cm above soil instead of just dragged directly on top of soil.

To keep from wearing out the coil frame.