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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 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 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?

A 24k with the same coils makes more sense, considering balance and weight. But the GMX come with the headphones and this package has the two coils I want the most for use in Australia. So the GMX won the coin toss. The GMX simply won because of that 6x4 DD coil, the added durability and waterproof capacity are great, but the lighter 24k has a lot of appeal. Goes to price and coil selection. The Minelab Equinox 800 with the smaller 6 inch coil, water proof, local support etc was a real competitor. The Equinox or its successor may later replace my Explorer Se Pro and Musketeer Advantage. This White's package with two coils and the headphones beat the local competition on local prices. So the GMX looks as if it will be my last new White's machine. Given the local lockdowns and restrictions in Melbourne Australia, I have not managed to dent my holiday/party budget. So that money instead goes to the GMX purchase. I'll be brewing my own coffee and baking my own muffins for a while yet, saving in the process... Santa came early this year.. All the best, take care and be kind to yourself and others.

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 would like to hear your input.

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.

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.

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

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.

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.

So, I have an area in the Colorado Rockies that I am trying to successfully detect with the GMT 24K. The main issue here is tons of magnetite and I mean tons. Imagine a regular sized plastic sandwich bag with a 2" thick sandwich sized amount of dirt inside it instead of a sandwich. I brought a couple of bags full of dirt like this home from an area that appears to be a drainage ditch that was at the end of a sluice run in a hydraulicked area. I got almost 1 cup full of varying from speck to marble sized magnetite by panning out that bag of dirt, so about 1/3 of the dirt was magnetite. So far, I have detected this long trench with a GMT 24k and an XP ORX with 9"HF coil. The 24K shows 8 segments of mineralization and a phase reading of 85 in Ground Scan mode. The ORX ground balances at 88 with the mineralization bar full. The GMT 24k overloads at sensitivity 4, VSAT maximum in VCO audio and no iron cancel. The ORX does not overload but I have to constantly ground balance, with sensitivy on 70, reactivity on 2.5 and Disc IAR 2, frequency 50. Getting any kind of zip zip signal in this sea of double beep boings is proving difficult. As I said, I brought some dirt home to test. I figured with all of the advanced settings on the GMT 24K I should be able to find something that works. I took one of the bags outside and laid it flat on a plastic 24"x12" Igloo cooler. With the 24K, 6.5" concentric or 10X5" DD coils in VCO Zip audio mode, sensitivity 3, VSAT maximum, threshold 2, XGB auto, I got various amounts of ground noise and plenty of medium to loud double beep boings while bobbing the coil or swinging over the bag. Just what I expected. If I ground balanced and locked XGB when pumping the coil it almost silenced the magnetite and I could swing over the bag with much quieter, little responses but still clearly magnetite boings. If I then pressed the Iron Cancel button (iron cancel discrimination was set on the numeral 2 not 2 bars so no bars were showing) the magnetite was virtually silent. I switched to beep audio and still virtually silent with just a faint threshold response, meaning that instead of a high tone or low tone there was a faint, medium tone, 2 way threshold target tone apart from the reference threshold, I guess. I took a .2 gram flat nugget and placed it under the corner of the bag of dirt and reset the settings to what I started with, VCO zip tone, XGB auto, no Iron Cancel and carefully ground scanned over the area of the bag that the nugget was not under to let the XGB system reset. Sweeping the nugget a few times I got mostly boing magnetite signals with a very faint hard to distinguish zip sound. I pressed Iron Cancel (still set on number 2, also tried 1 with the same result, no disc bars showing) and got virtually nothing, with no zip zip responses of any kind. I locked the quietest XGB setting, with the lock button, no Iron Cancel and VCO audio. I got a nice zip zip with a little magnetite boing. I pressed Iron Cancel and literally got no signal of any kind, complete silence during sweeps. I thought WTH, and pressed the beep mode button for high and low tone pitch audio. I did not get a high tone or a low tone but I did get a very clear 2 way medium tone threshold response with a very quiet background except for the actual threshold tone.............? I removed the nugget and swept over the bag again with the same settings and got only a very faint medium pitched threshold?? tone occasional response. So, hunting this area in VCO audio, XGB locked, Iron Cancel off, sens. on 3, VSAT maxed, might work but I would be digging a lot of magnetite. Hunting in Beep mode with Iron Cancel On and listening for that medium whatever it is tone might work too.......? There is no mention of this medium toned, what I am calling threshold tone response in the manual anywhere. I used to hear something like this on my MX5 using multi tone modes with the threshold set on low when I encountered a target that was just past the range of normal detection audio or numerical target ID detection. The MX5 let me know something was there. I am not sure what this tone is called or if it is the same thing that is happening on the 24K. Personally I like it if I can depend on it........... Any comments would be greatly appreciated. By the way, I ran the ORX and Equinox over the same target scenario. The ORX in Gold 1 with a little tweaking could hit the nugget but only with sensitivity turned way down (60 -70) in order to quiet the magnetite responses down enough to hear the target. Frequency 50 kHz, GB 88, Sensitivity 60 to 70, Reactivity 2.5 Disc IAR 1 or 2, Iron Volume off, Threshold 4, tons of ground balancing required just to hear a clear zip, zip. The Equinox 800, 6" coil Gold 1 multi, -9 rejected, GB 1, sensitivity 15, threshold 10, recovery speed 4 to 6, FE 0, had no problem giving a beautiful zip, zip on the .2 gram nugget with minimal ground noise............Hum! Jeff

I noticed today emi was not affecting the GMX w/ 6" concentric coil at all. The Gold Kruzer and XP Orx were going crazy. I had to turn the sensitivity way down on the Gold Kruzer. Different frequency helped the Orx. The GMX sensitivity was max at 10 with no noise. Wish it weighed 2 lbs but it is the way it is. Becoming my favorite water hunter. Taking it in the water tomorrow. 6x10 coil is on the way.

How well does the 6x10 coil float in the water? Like a cork? I'm using the GMX lake hunting and want the 6x10 coil for coverage but if it floats to much I won't get it.