If you don't have the manual, download the CZ21 manual...same as the CZ20 except the pin point button is different.
Ground balance using the bobbing method. When doing so, the detector should be in autotune and the sensitivity at max along with the volume pretty high so you can listen to the threshold changing as you bob the coil up and down. Once completed, remember to turn down the volume and lower the sensitivity if you switch to discriminate mode prior to hunting.
If you are hunting in discriminate mode, set it at 0 and listen to all targets. Make sure the sensitivity is not too high...you should probably run it no more than 3-4 to start. Hunting in 0 discriminate mode allows you to hear the iron targets that bleed over ( ie, wrap) into the high tone. They will be low tone/ high tone hits. If you have your discrimination set to 1 or higher, the low tone is disabled and you will only hear the high tone hit on these bleeding targets...and get fooled by digging deep iron. One of the main things that causes new CZ users to dig much more iron than normal. They run it in discriminate mode 1 or higher. If there is TONS of iron, then you can run it that way...just make sure when you get a high tone hit, it's repeatable in all directions, and just to make sure, switch to 0 to see if any low tone comes into play.
Dig all REPEATABLE high tones, mid tones and even dig any low tone/mid tone bounces. These can be deep gold targets.
If the area is not too riddled with iron, you can run in auto-tune( ie, all metal) and dig all the sharper, smaller sounding targets. The longer, screeching, double hits and warbles are mostly iron. Auto-tune makes a very wide footprint and more sensitive coil so you will find a lot of small targets like rivets, bb's, etc. using that setting. It is a really cool way to run it to learn how the all metal mode reacts on the CZ. You can tell a lot about a target. I was out today with my CZ and running in all metal on the beach. A lot of hot rocks were in an area and were sounding off with a very faint change in threshold. When switching over to 0, they went away. Once I started to know how they were sounding, I just moved along.
Not sure what coil size is on your CZ20, but if it's the 8 inch coil, then you don't even need to use the pin point button. X the target and its almost always right in the center hole of the coil.
In my opinion the CZ is one of the best all around detectors ever made. The only caveat with the CZ20/CZ21 is that it is always in salt mode, so the sensitivity to SMALL gold ( ie, small earrings, thin chains. etc.), is below average.
JC
