All about Coils

A great write up by Nenad lonic.

Nenad gives easy to understand explanations.
Whether for those just starting out, or those with some hours on the ground, different coils give different results and can have specific requirements and limitations.
Nenad breaks it down to help you decide which is the right coil for your detecting style, target type, size and depth.

https://www.minelab.com/usa/community/treasure-talk/gold-detector-coils-explained-for-minelab-s-gpx-and-gpz-series-detectors