Another great topic!!!!!
I actually read the online manual for the Equinox and after using it for awhile I had to keep repeating over and over-----------the pinpoint function and depth meter are calibrated for coin sized objects, the pinpoint function and depth meter are.....
Most of the places I coin hunt are in parks and areas where I have to coin pop with a screwdriver. Creating a slit and spreading it is okay but no plug digging and no shovels, trowels, etc. So, I really depend on the Equinox pinpoint feature to size targets. The Nox pinpoint features and quirks took some getting used to but coming from an X-Terra I was expecting weird stuff and I got it. I was about an inch off on coin targets for at least the first 40 hours!!!
I don't get to hunt beaches that often, but one way I use the pinpoint feature on the Equinox is kind of like tracing the outline of an object in the sand like Florida Son did, like determining how big the area is of the target and its probable shape by tracing its edges. It has become second nature now and I rarely get fooled by a crushed can. I only dig the shallow ones now in case they are masking something else.
It did take me awhile to learn that if I get a big (area wise) signal in the high teens to mid 20s that appears to be only one depth arrow deep I should assume it is probably more like 3 or 4 depth arrows deep and is an aluminum can or large can fragment. I go back into detect mode and do the coil lift and short swing thing..... small coins beeps really do stop beeping pretty quickly and large cans keep beeping for quite a ways. If I'm still not sure I use my probe and if I don't hit any shallow object a couple of inches deep in the pinpointed area I move on.
Sometimes a shallow coin spill, or shallow jewelry (big chain) spill can mimic large can or can slaw audio wise and with really jumpy numbers . So can deep big iron since it will give negative numbers in the center and often really high numbers like 38, 39 on its perimeter. I use the pinpoint function to see if there is more than one target, or overlapping targets. The pinpoint sound will stop and start over multiple targets. Sometimes it does this very faintly over adjacent targets at the same level.
Depending on soil conditions, I think I can tell the difference between nickels/gold and some aluminum can slaw and pull tabs by the really high pinpoint pitch some aluminum targets make. The pinpoint pitch sometimes seems to be lower for nickels and gold jewelry/bling at the same depth which is usually down to about 6" where I hunt. Below that depth, I just keep chiseling with my screwdriver if the numbers and size of the target are right. This does seem to be dependent on soil moisture and temperature and the thickness of the aluminum target. The pitch gets lower and fainter the deeper the coin sized object for sure.
I have actually just hunted with the pinpoint feature in bed of nails situations and especially gold prospecting where I'm digging everything. I just do it for awhile when I'm tired of looking at numbers and listening to crazy tones.....
Jeff
Most of the time coin sized object and especially coins themselves that aren't too deep will have very distinct borders that are just a little larger than the coin.