G'day Bob.
The first thing that you can do once you've got your machine, is play with it at home. Turn it on and run it in factory presets at first. As I don't know what your coins are made of, I would suggest that you start using it in the all metal mode and waive as many different coins over the coil (or the coil over the coins) to determine where they are going to register, where they are going to show up. The Ace, like many brands of detectors, are set up to find coins in the US! so the coins mode may well knock out desirable targets. Here in Australia, we run in the Jewellery mode, as that mode covers our coins better. There is a custom mode that you can set up, if one of the other modes are not suitable.
A lot is going to depend on what your coins are made of. Most countries make their coins of non ferrous materials, which is what detectors like the Ace are set up form. there are also plenty of countries around that make their coins out of iron. Either way, it's not a big drama, as all coins are alike in each country, and will therefore give the same information to the detector. What your job will be, is to determine, what that behavior is, and how is that different from a rubbish target! It is really quite a simple process. Once you have determined where your coins are going to show up on the detector, and how some of them may bounce around between the different spots, go out and hunt for a while. Children's playground or a beach is always a good spot to start, as these places are the easiest places to recover your targets from. Recover and keep all items from your first hunt or 2.
Bring these items home and practice on them so that you can learn to tell them apart after a bit of experience. You are not going to be able to tell some targets apart from coins, that is just the nature of the hobby, and all detectors get fooled, regardless of how clever the detectors are. The best detector you have, is your ears and eyes.
if you have coins made out of non ferrous materials, then your job will be easier. All non ferrous coins will lock onto a single notch, or bounce to the next notch. Also this applies to the depth metre as well. If they bounce around a lot, then it is a junk target, or it is possible that there is a second target in the ground next to it. Experience will be your guide here. If ever in doubt, dig. The ability to remain curious here, is your best teacher and also helps to put frustrations of learning a new detector in prospective here.
Pinpointing with the Ace, is one of it's greatest assets. It is so accurate (once learned) that it will help learning the machine a lot easier. Trust me when I say that, because having a machine as good as the Ace for pinpointing, removes the single greatest frustrations of the hobby. That is actually locating the target that you have just heard with the detector.
So how do you pinpoint. Very simple. there are 2 methods. First, is the shallow pinpointing method, which is also the most commonly used methods. After waiving the detector over the ground in the all metal mode to make sure that there is nothing there, place a coin on the ground, press and waive the coil over it. You will hear the sound increase to it's maximum volume as the centre of the coil passes over the coin. As you have the coin in the centre of the coil, then slide the coil back and listen for how the coin losses the signal as the inner coil passes over the top of the coin. Just wiggle the coil around a bit as the signal drops off, as this helps to ensure that you had the coin centred right in the first place (gives the greatest accuracy). Do the same with junk targets. Listening to how the signal is lost, gives you some good information as to what a target is also, although this only applies to targets in the top 2 inches of soil though. You will see just how easy this is to do.
The second method of pinpointing is called deep pinpointing, and is also easy to master. Again starting with your coin on the ground, press the pinpoint button again and passover the coin. This time however, once you are over the coin again, hit and hold the pinpoint button a second time (this is called detuning) and listen to how the signal has changed! A lot smaller signal. The goal here, is to use that cut out you see in the middle of the coil to be the place where you are going to locate the coin. The 2 striking things that will will notice about the signal now, is the the width of the signal is now about 2 coin widths across and behind the horizontal centre line of the coil, you now have no signal in the back half of the coil! Watching the coin, slide the coil over it, so that 1, you have the coin lined up in that cut out, and 2 push the coil forward a listen to where the coin is when you lose the signal. As soon as you loose the signal, slide the coil forward, very slowly and see where the coin is when you get the signal back (make sure that you hold down the pinpoint button though out this process). The coin souled be either in the middle of the cut out or very close. Practice this a bit and you will be able to do it in the field as easy as can be! This second method is a good back up to the first method should a target be hard to locate or 6+ inches deep! Sometimes you will lose a target when doing this (a null) so check it couple of times if you do. If it stays lost, then you've just eliminated a dud target. You want lose a coin like this under 'normal' circumstances!
Hopefully I haven't rambled on for too long and bored you to death.
Good luck, and if you are having troubles, just keep posting questions.
Mick Evans.