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When I use my Gmx with the 6' concentric coil in a beach section with a high concentration of black sand it is overloading all the time and I have to raise coil about an inch to have it go away.I then go for the nice zip sound and I usually get a coin because all the light stuff has been swept away. This 48kz machine is very hot with this coil.Would a bigger DD coil stop this overloading?

The last time I took it to the beach I found only 1 penny while my friends found about 3.50 each plus 1 had a silver ring.It would not be hard to beat this total so off to a thin but very junky beach we went(different beach then other time).There were bottle caps galore and junk from the many fires this beach has at night plus what is dropped during the day.There was a good cut along the shore and I dug the nice zip sounds in this black sand section and got about 10 coins and 5 were nickels plus a junk iron ring.In 5 sens. setting the black sand would over load without there even being a target sometimes . It was that hot in this section.I then hunted in the tan sand and got a clean gold color chain that was iron.Toward the end of the hunt I got a nice tight zip and out came a moon 10k hoop earring at 1.6 grams.It is the first gold me and my friends have found on the dry sand with over 100 hours between us in hunting time.The GMX redeems it self on the beach and gives me 10 gold to be in the double digit gold club with OBN but still way behind him.I took it in a pond like area by a creek mouth and the machine did not act any different which is good.I might take it in the water next. I will try to get a picture tomorrow. I have to learn how to do it.

I am going to write a little bit about my outings with the GMX. It will be fun and maybe I will be able to harvest some advice from more experienced detector/prospectors. I did go to a creek/swimming hole but had very little time with the detector. I have a very young family and it can be hard to concentrate when 1 of my 4 kids is getting hurt or stuck or .... so I gave up on it pretty quickly that day. I was able to get out to the Lynx Creek withdrawal area with a friend. He's new as well and using a Time Ranger Pro. I looked on Google Earth and picked out a wash that ran parallel with the main creek. That way we would be able to detect in and out on our hike. Unfortunately, the borders of the withdrawal area are not marked well on the maps I found available but the private claim the wash was on is marked really well once you get out there. We hiked along the fence for a while looking for area that might be interesting to detect. The only spot I found was a large hole. The material excavated was a different color than the surrounding soil so I dug a few iron targets from the pile. It doesn't seem like anyone has thoroughly gone through all that material with a detector and there are many hot rocks and pieces of iron mixed in with the material. Eventually, we hiked down to the main creek bed. My partner moved quite a bit faster than me and found many tin cans along the way. I tried to be as meticulous as I could whenever we found a wash to detect and found only one large can. I think I will bring him on my future trips and send him in front of me to remove large trash items. We detected up the mostly dry creek bed and dug trash target after trash target. I heard it was trashy here but I had no idea it would be this bad. The area had many hot rocks which would send my detector into overload if touched. I ended up needing to set the detector down to level 3 sensitivity just to get around without overloading constantly. All in all it was a fun outing with some rugged hiking and a near heart attack when a deer jumped up about 5 feet in front of me. I was using the 6inch concentric coil but would like to take the 4x6 double d out here and see if it is able to handle the hot rocks any better. Outing 3 was to the same area but I wanted to try the mineralization tracking feature of the detector. Lynx creek is more known for gold panning so I thought I might have better success that way. I swung it around and everything in the area is really mineralized. I was able to find a couple spots with a bit of an increase on the meter and it was really did seem like there was quite a bit more black sand in the areas the detector was interested in. I panned for a while in these areas but found no gold. After a while I wanted to try detecting up the hillside in front of me. It was pretty steep and, I thought, difficult enough to deter some prospectors. When I got up there it was definitely steep and full of loose rocks. I was only able to detect a small portion of the hillside but I found plenty bullets. Many of the loose rocks were quite hot. At this point I was getting better at listening to the detector and figuring out which sounds are hot rocks but it was still pretty challenging on this hillside I was worried about pushing one of the rocks out of the way and killing one of my kids who might have wandered underneath me. After a short time of this I could tell that my families patience had run out and we probably needed to head home, still gold-less Unfortunately, there is a new issue in this area. The management of the forest forgot to renew the mineral withdrawal and now large areas are now private claims. The area i had originally planned on going the 3rd outing was all claimed up with fresh signs everywhere. I can only assume fences will follow. In the end I don't know if Lynx Creek is a good area to detect. If I come out here again I will bring my TDI and see if that makes the hot rocks anymore bearable. I am digging all the targets anyway so I don't know if the discrimination afforded by the GMX is helping. I will try and head out again soon. Hopefully the temps here in AZ will go down soon and I can get into more of the GPAA claims in the area.

Do you think these machines have less sens. for small targets at half battery charge vs. a full charge.I would also like to know if certain batteries give a better performance.Thank You for looking.

The first time I ever hunted with this coil got me silver and found some coins by the poles in this pounded play ground.It was not much in coins at 62 cents ,but they were close to the metal poles and were missed because they have been there or a while.The silver I found was a earring back that was a tad longer then an 1/8 inch and a tad less in width then an 1/'8 inch which is the smallest silver or gold jewelry that I ever found.I also found a clad stud earring.This coil falses if I move it to fast and is not as stable as the 6inch coil which I don't understand.I like this machine more then my Nox for tot-lots.It was less then a grain in weight for the earring back.

That is hit a .5 grain Lawrence high antimony #9 lead pellet buried a full 2inches in moderate ground.The Gmx did it no problem in all angles with a little to spare with 6" coil .The X-terra with 6"dd in 18kz did not give a signal at max sens.I see why you use gold machines for tiny targets because they make a big difference and because if there is more small gold compared to big gold=more action.This was in a high emi setting in my yard with many power lines close by but done at mid - night when emi was less.The Emi would effect the Gmx certain times of the day where the signal was more skewed.

I was too excited to wait for a sub 110 degree so I tested out my new GMX in the shag carpet in my office. I did pretty well. I had about twice as much change there but one of my daughters spotted it and made off with it. I think I may need to take this rug outside and shake it out. Who knows what else is in there....

I am considering buying a second hand GMX but the situation with counterfeits has me worried. Are there any tips with regards to White's detectors to ensure I am getting the real deal?

I grabbed my 8.5 gram,15/16 of an inch long ,6mm wide platinum ring I found and buried it on edge where the top of the edge is about 6'' . I grabbed the Gmx with the 6inch concentric coil and facing the edge it gave me a nice zip with room to spare,When I went with the edge the signal was about the same.The ID was in the upper 90's or near zero which seems like wrap around numbers.If you are brave and take your Gmx in the water I would dig this signal in better jewelry swim spots with not to much junk(nice roped areas) I used mid SAT setting on test.ID is around nickel in ground air test.Not bad for a tough target with a small coil.

I tried the gold chain from my Gmx test with my 11" coil on my nox and this machine just walloped it on multi freq. gold2 mode with sens. at 22.It gave me the proper #4 id mostly on this 7" target with a few 3or 5 numbers if I was off center a bit.I could raise the coil over 10" and still get it.In 20 kz. at 22 sens. it hit it very hard with very bouncy id from 2to 11 .In 40 kz. at max sens. it pounded it very hard also with less bouncy id from 2to 8. I am very impressed with this mode on this target.

I tested a heavy type chain like the one Againstmywill showed in the jewelry(maybe a little thicker) section called( chain numbers).I tested the Gmx and it just slammed it with a solid 96 number which I think is a upaverage since nox gives it a 4 when I lay it on the ground. I could raise coil over 5"and still get it.Maybe we should not pass penny hits with this machine.I used 6' coil on this test which is buried in dry dirt.

I'm reaching out to other dealers out there who might have a 4x6 coil and spare battery pack for the 24K. Thanks! Walt

In my now bone dry ground I buried this target at about 3inches,maybe a tad more.With the earring lying flat on the ground and the post facing me I might get a weak signal one way but it is so soft and not repeatable that it would be hard to hunt this way with the GMX and 4by6 coil.It is hard also to tell it from a false signal.This coil with the cover on is a fail for me in this test.The earring is 10k at 2.8 grains.

I was detecting about 8 years ago when someone walking on the beach handed me a earring they just picked up on the shoreline.That was the easiest gold I ever got. This is the test target which is .53 grams and 3/4 inches in diameter thin hoop yellow 10k earring that I buried a little over 4'' with open clasp which is way more difficult.I tried the GMX with a 10 sens. and boost 2 with sat in middle setting and I got a soft signal on the target and I could lift the coil and still get it in 1 direction but in other angles it was a little weaker.It seems you need more coil control on this machine for tough targets with the sat.This test is a pass.

I would like to hear your input.

The chain I am testing is the type a Fbs machine can 't hit or barely gets it . An 8 gram 20 inch 18k yellow gold rope type chain.The xterra ground reading for my testing site is about 24,000. At 0-10,000 =mild ground,10-100,000= moderate ground,100, 000-1,000,000 =hot ground.The ground phase is about a 8.At a reading over 20 you should use a concentric,under 20= dd coil. That is for xterra machine which is single frequency machine that switches frequencies.I tried the 48 kz. Gmx first an it hit the about 5inch deep chain with no problem and above 50 id numbers and I could raise the coil about 3 inches.That is very good.I then tried the Nox in pk.1 and that was a no go.I then tried pk.2 in multi freq. and 20 sens. and got a nice 1-2 id in mulit tone.I tried 20kz. in pk2 and got average hit with up average id.I tried 40kz. and got a better hit with more solid up averaging in the id.I then went to gold 2 mode and mulit freq. and 20 sens. and got great hit with solid id. In 20 kz. in gold mode it did pretty good with up average numbers.In 40 kz it hit harder then all because I could crank sens. to 24 with up average numbers that would make me dig. With this machine you could hunt silver with the best of them then change modes and hunt tough gold with the best of them.I tried the xterra with the 9inch 18kz .concentric and in coin mode I got a wrap around signal that might make me dig.In prospect mode I got good soft signal with 2 inches of air over target to spare. The test for Nox is with 11 inch coil. The Gmx had 6 inch concentric.

Is the battery door/holder for the MX7 the same as the GM24K? Jim

Burying this small ring at 8" in 4 bar Gmx dirt I grabbed the Nox for a front yard test. It is semi high emi area.I used park1 first and could get some what stable at a sen. of 19 with F2 at 0 and 50tone.All I got was a small broken sound.I put it in Park 2 and every thing the same and I got a much stronger signal with good id hits mixed with some iron.It got better or worse if I turned on target.I then put it in gold 2 and tried multi freq. first at 19 sens. It gave a solid hit and not bad id.In 20 kz in same mode I could bump up sens to 22 and it gave a strong signal with id all over the place. I then put it in 40 kz and I could put the sen. at 24 and it gave a very strong signal with id all over the place. The Recovery speed was 4 on all tests.I then tried the Whites Gmx with the 4by6 dd coil and it did not give a sound.I will try the 6' coil for Gmx next.

I have a Kezef creations 3mm 10k white gold topaz pair of earrings that I got for less then $12 on Amazon with silicon backing. It seems that the 6.5"concentric hits it much better so far when it's on the ground.I would think the much smaller 4by 6 DD would hit it about the same because of it's small size.I will have to do more testing.Bad coil? What do you think?

I will be getting a Whites GMX in a few days that will be second hand.I hope it does good in shallow water.If not then it will be a turf and tot lot machine .That is 2 whites in a row for a purchace.I got a TRX last month. It took me 20 years to get a whites .A new machine always makes me try harder when I get it.It will be fun to see what it can do.

The 6" concentric coil floats to the top to easy. It works ok when I'm sweeping but when I stop and lean the detector against me the coil floats to the top. Turning sensitivity down does help some in the water. Also Isat works with the sensitivity max. Going to be use my Gold Kruzer now. I liked the Gmx a lot on land but not lake hunting. Probably perfect for streams.

On the "Spud Diggers" YouTube channel appears the video "White's GMX and 24K: All 4 coils tested". We did an in-ground performance comparison using an extremely mineralized drywash pile from a black sand-laden auriferous wash. Coils tested: 14x8, 10x6, 6x4, 6.5 concentric. Nuggets tested: 1/4 grain (laminated to a business card), 1/2 grain, (almost) one grain, and one gram, at one inch depth. GAIN settings of 10, 5, and "0". Note especially how well the 6.5" concentric and 14x8 DD coils performed. HH Jim

from Whites Electronics.........enjoy, Jeff

Locked or unlocked no ground balance. I would get a sound every time I lifted the coil. It had a constant id of 83 to 90 as I swept the coil. I was using the 6" concentric coil. In tone mode it beeped constantly as I swept. It works fine on land. I have the 6x10 coil ordered so hopefully it works. I'm surprised it didn't work in the water. On land the ground is all mild so I assumed in the water was mild. I did have sensitivity at 10. I haven't had a problem with other detectors there even with concentric coils.