All very good responses re: the intricacies of these machines!
I find that most of the time the 'one way' signals tend to be iron. The most important things I've discovered: move around the target from all directions to get as much information as you can. As mentioned above, if the area where you mentally 'pinpoint' the target tends to 'shift' as you scan the target from different angles, that can indicate iron as well.
On really iffy signals I'll go wide open to get even more information. Here I look to see that the signal mentally pinpoints (not the pinpoint function) in a single tight location, while moving around it. This is the only time I'll really look at the cursor because, at most places, these deep iffies, if a good target, tend to rest along the right side (even though the tone may vary.)
Another thing I notice is that these variables change in different parks. Some places, any nulling at all
always (or almost always) results in iron, while at others sometimes the 'one-ways' and partial nulls result in on-edge silver or silver next to iron.
As stated above again, the best thing to do is put in MANY hours on the machine, take your time with your signals, move around them and learn as much as you can, then dig them up. Eventually it becomes second nature and you'll find a 'balance' between iron and coins at whichever particular turf spot you're at.
Some people think it's a bad thing that we dig iron with Minelabs. With the number of good coins I've found next to or nested with iron in the same hole, I've found it to be worth it. (At least for the first couple pounds per hunt!
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