When experimenting you will have a bit of an eye opener about the differences between timings and resulting depth differences especially with medium to larger coils on large targets. When I was testing this detector for Minelab before it's release we worked many hours with different coils and timings regarding target size and depth.... If you can find a natural deep non ferrous sounding target that is faint adjust your detector and listen to the target in different timings to get the best results. You can bury one on the edge of hearing it with the "fine gold" timings then try different timings and coils. Learning your machine completely is the key to finding toe deeper and missed nuggets. Minelab DID NOT and these timings and settings for no reason and learning them is the key as said.