1 - Make sure you learn how to ground balance using the bobbing method. Once you ground balance in auto-tune and switch to discrimination mode, make sure you lower the sensitivity level. This is important. Remember you will be ground balancing in auto-tune mode with sensitivity at 9 or 10. You have to lower it when switching to discriminate mode or you will get lots of falsing.
2 - Don't run sensitivity past 3 or 4 to start. The CZ can go deep at low sensitivity levels, and you don't have to overdrive it. Once you get into the sensitivity levels of 5 and higher, there is much more chances of falsing...plus, the depth does not change much if at all, while the footprint of the coil is increased and it's much more sensitive. When you go from sensitivity level 2 to 4, it' does not double the depth...similar from 3 to 6 does not double depth you are getting at level 3...it only makes the coil much more 'hot'. Obviously level 1 is not as deep as level 2, etc, but my point is, at a certain level ( depending on the machine) the depth stabilizes and any level higher is now making the coil a wider foot print and more suspect to target masking.
This is in discrimination mode. In auto-tune/all metal, you have to run sensitivity high since it is related to the 'threshold' sound in auto-tune and you want to hear the slight 'threshold' hum/warble in auto-tune and you can only hear that when the sensitivity is turned up to 9 or 10. I put 'threshold' in quotes since the CZ is a silent search machine and not threshold based per se.
3 - If running in discrimination mode, run at level 0 and listen to ALL targets. You can tell and hear iron much better when you actually hear it versus discriminating it out. At level 1 and higher, the low tone of iron is disabled, so if you get the low tone/high tone iron bounces, you will only hear the high tone at those levels and this may fool you into thinking its a good target. Once you learn the machine, you can cherry pick, and there are going to be times when there are tons of small iron targets, ie. nails, and you want to discriminate them out. BUT...you have a chance to miss things. I have learned over the years to tough it out and run 0 discrimination no matter where I am. It helps a ton in not chasing those false signals and digging deep nails thinking they are deep coins. There will be a point where you will be able to tell a high tone coin hit from a high tone false iron hit. Point is...LISTEN TO ALL TARGETS.
4 - Sweep slow and low.
5 - HAVE FUN. Its a great detector.
JC