What he is doing is the following.
1. He has the detector in Prospecting Mode.
2. We will assume he was in Standard GB Mode not Beach GB Mode.
3. He has Ground Tracking On.
4. He has pushed the Ground Balance button so that he can see what the relative ground phase is and how it changes as he moves over the surface.
Let's assume his relative ground phase is Tracking along from 45 to 50. So after checking this initially at the start of his hunt, he re-checks it from time to time to see if the ground has changed dramatically by pushing the GB button and looking at the numbers.
Assume he does not now have the GB button pushed and is hunting along as one normally does.in Prospecting mode. He gets what appears to be a good target signal, but is in an area where Hot Rocks have been giving him trouble. He pushes the GB button and watches to see if the Tracking function will cause the GB relative phase numbers to change dramatically while swinging over the target he is investigating. He says that he has discovered that if it is a valid target the relative ground phase numbers will not change dramatically, but if it is a Hot Rock, it will Track down to the number 20. By Tracking "down" to the number 20 I assumed therefore his background relative ground phase was somewhere above 20, therefore I used 45 to 50 for the example. Your ground balance numbers of course can be anything depending on where you are hunting, and are also coil dependent.
HH
BarnacleBill
