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Why PI Detector at DIV

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Why PI Detector at DIV
January 08, 2017 12:28PM
Because this question gets asked repeatedly (and rightly so) by many first time and even veteran DIVers, thought I would put together a little Primer on detector technology at DIV from what I have learned about relic hunting specific to the Culpeper general vicinity and DIV in particular. I am not an expert but have tried to keep it factual without a lot of "opinion". I have only been to a handful of DIVs. I will invariably have written in some typos, mistakes and misconceptions. And of course everyone has their own opinion. So...please critique my writeup, add your own thoughts, have spirited arguments, because this thread is all about learning for the new and old DIVer alike. Also, in accordance with the DIV disclosure rules, I have not intentionally provided any sensitive information that has not been made available on the public forum, to my knowledge.

First some background on Culpeper General Vicinity where many DIV hunts are held:

Culpeper was a main crossroads in Virginia for both rail and wagon and its central Virginia location made it a great staging point for Army of the Potomac CW units to move in any direction to attempt to counter the Army of Northern Virginia (Lee) from Richmond to Gettysburg. There were some local battles in Culpeper including the Battle of Cedar Mountain and the largest cavalry battle of the CW at Brandy Station plus countless other minor skirmishes. The farmlands DIV secures to hunt are chosen because they are located on known CW army unit winter encampments primarily in the 1863-64 time frame (i.e., after Cedar Mountain (1862)/Fredericksburg (1862)/Chancellorsville (1863)/Brandy Station (1863)/Gettysburg (1863) but before the Battle of the Wilderness just east (Spring 1864)). But the relics found are not just limited to that Winter encampment time frame since troops continually camped, fought, and passed through the area during the entire war based on Culpeper's strategic location. These areas have been hunted on and off for decaes for CW relics. The soil is great for farming but horrible for detecting because the red clay is full of ferrous mineralization that is to radio signals used to detect metal like headlights trying to punch through fog. Also, the fields are littered with iron farm junk (broken pieces of iron farm machinery) and the small square nails which were used to build fences and huts for the camps. These small iron targets are the bane of the DIVer. They can sound great in your headphones and are therefore hard to "brain" discriminate out unless you know the subtle audio cues so you will dig dozens of these things and they can mask legitimate targets should you choose to just ignore them and move on. While surface finds still exist, they are relatively rare. Veteran DIV hunters are looking for those deep large tones (e.g., barrel bands) that indicate a trash pit or hut from which they can dig down 2 or 3 feet or more and pull out a cache of metal and unbroken glass CW relics. The relics are deep because of decades of relic hunting, farm work, and erosion. There was a renaissance of sorts with the newer technology PI machines in the early 2000's from which more, deeper "surface" relics were found, but if you do the math DIV 36/37 (now 40 since I first wrote this) is a pretty high number so you can figure these various DIV sites have been hit pretty hard by DIVers and lone wolfs though there are still some less pounded territory (e.g., DIV 36 site).

Pulse Induction Machines: The most effective metal detecting technology for such conditions is called Pulse Induction. Pulse Induction machines will find all the metal in whatever medium (i.e., soil condition) you are searching (beach, underwater, high soil mineralization, and small gold nugget and meteorite hunting). They are not your typical coinshooting machine, nor should they be for many reasons. They are designed primarily for gold prospecting in harsh soil. DIV detectorists have repurposed them for relic hunting and they get the job done. Except for the most expensive machines, they lack discrimination (iron rejection) so if you want to dig up bobby pins and fish sinkers at 3 feet on the beach all day, you may want to stay away unless you really want to find that 3 foot deep gold diamond ring. Also, they tend to be less compact than VLF machines because they have to radiate more power into the ground. The discrimination based machines that will blank out or grunt at large iron and are more expensive but are best suited for the DIV situation because they don't care about ground mineralization and are DEEP. Deeper than any VLF machine out there under the same soil conditions. There are still surface targets to be found at DIV, but are relatively rare. They get plowed up to the surface or have just been missed by detectorists over the years (perhaps the button was edge on or under a big piece of iron trash or a coil just never made it over the target). Those surface finds (within about 5-7 inches to the surface) are what the VLF may be able to see in these conditions. VLFs cannot penetrate much more than that because of the soil mineralization unless the target is very large. They can also work in wooded areas where there is less mineralization, but underbrush and acreage limit your opportunity there.. More on VLF below. The three most popular PI machines are the Whites TDI/TDI Pro/TDI SL machines which run used $600 to $1200 new. They are relatively lightweight compared to the other PI's but lack iron discrimination. They can be set up to search on all metal or just low conductor like brass, so are a known button magnet machine, but you will have trouble telling a bullet from a square nail (see above). TDI is not weatherproof. The next in terms of cost is the Garrett Infinium (no longer manufactured) which you might be able to still find used for closer to $1000, then comes the successor to the Infinium - the mil spec Garrett ATX ($1500 used to $2500 new). Based on a military grade mine sweeper, it folds up compact, is waterproof to 10 feet similar to the AT Pro, and has IRON grunt discrimination, auto frequency tune, and is plenty deep. The main knock against the ATX is its weight. To swing it all day, you really need a harness. It is also a visual/audio machine. You rely on the tones and the led bargraph display of target strength to make the decision to dig. Very easy to set up and go. Not a lot of accessory coil choices. Finally, the gold standard of DIV is the Minelab GPX series (4500/4800/5000) you can spend anywhere from just over $2K to $5K on these machines but there is a reason for their popularity. They can be tweaked to your heart's content for the soil conditions, they are lighter than the ATX, they have tons of after market coil choices and accessories (compact battery pack vs. the bulky separate battery/amplifier pack Minelab supplies), and they get the job done because they are an audio only machine in which the subtleties in the audio signal help you to "visualize" the characteristics of the target you are swinging over. They are not weatherproof so you have to home brew a bread bag/ziplock bag setup to protect your detector in the rain and the Minelab coils are (notoriously) not waterproof so you need after market (e.g., Coiltek, Detech) waterproof coils to hunt in the rain/snow. Expensive but worth it to those going after the big prizes in the ground and who do it often enough that the "investiment" is worth it. Though I don't know many DIVers who sell their finds to fund their machines, so I use the term "investment" figuratively.

VLF Machines: You will be able to find relics using an AT Pro or any other mid to high range VLF machine that has the ability to compensate for ground conductivity (manual and/or auto ground balancing). A inexpensive but otherwise great coin shooting machine such as the Teknetics Delta will not perform well at all in Culpeper soil because of its high mineralization and the machine's fixed soil conductivity setting that is set for average soil conditions (that is also why it is also not a good wet sand beach machine). So if you have an entry level VLF machine, it will not work well at all at DIV. Besides the AT Pro, some VLF machines that have worked well at DIV based on what I have seen and read - Whites MXT, Fisher F70/F75, Teknetics T2/G2, Teknetics Patriot Series, AT Pro or AT Gold, XP Deus, even the much maligned Whites MX Sport. The higher operating frequency (usually designated "gold" in their name) vlf machines tend to do better because they penetrate the mineralized soil better and hit harder on the snall, mid-conductors (brass, small lead) that comprise most desired relics such as buttons and knapsack hardware. You may not find the deep trash pit or hut with a vlf (but it is still possible) but you can find surface bullets, buttons, buckles, and the occasional plate, corps badge, or id tag that just happens to be within a few inches of the surface and was missed all these years. Also some surface finds can lead to deep huts when you put shovel to soil to recover the target and find charcoal, broken glass, or multiple targets in the hole. If that is the case, then you will want to keep digging and not just recover the primary target.

You need to decide whether it is worth it to invest in a new machine just for DIV. I would think about whether I would use the machine again back home before I make that investment. The DIV favorite machines do have good resale value to DIVers should you go that route and used machines are constantly being advertised on the By/Sale/Trade forum on the Treasure Spot. Johnny "JDug" White rents PI machiines for DIV but he may or may not be rented out (PM him if interested) and some may be able to loan you a backup machine (I have TDI that I am debating keeping as a backup or selling before DIV). If you do decide to invest in a PI machine, it can be used anywhere, but they do have drawbacks compared to VLF machines in situations where a good VLF machine can get the job done.

Feel free to add on information in followup posts. Thanks.

Amending this post to add some invaluable information from Streak! posted to a DIV private forum regarding a step-by-step method to set up your GPX for quiet stable operation (Thanks Streak! now we have it for perpetuity):

Getting your machine quiet and stable using a GPX is the holy grail. Too noisy, and you just wont hear those faint deep keepers.
This is a case where almost always "less is more". Too many guys overdrive their machines thinking its giving them an edge, but it just aint so. shrug
Be cautious when copying someone else's settings as well. There IS no magic set of parameters that will work for everyone everywhere. The best settings are ones that work for YOU in the area YOU are detecting in and YOU are the only one that can determine that. You can and will find stuff just copying from others, but you will never have your machine truly dialed in.
The best place to start, especially when detecting a new unknown place, is in normal. This will allow you to test the ground to see what it will allow. IF the machine is stable in normal, then you can progressively go to more aggressive timings as you need/want to.
You will need a couple things right off. A stable frequency. The correct ground balance. The correct timing for that soil. A stable sensitivity setting.
I have found that a milder timing with a higher sens setting is far better than the opposite.
I generally start with a simple procedure. Fire the machine up, making sure the toggles in the front are in the correct places (fixed GB, DD coil, normal). These can be bumped so don't assume they are always correct. (especially if you have the machine wrapped for foul weather). Set your sensitivity at 8 to start out. (you can bump it up as ground conditions will allow)
I also do not ever use deep or boost in the audio in the rear settings as it can too often make the machine noisier than it needs to be, (trust me) with no real gains. Same with the deep setting in the front, UNLESS I'm looking for deep shells or trash pits. The deep setting in the front wont do squat for "most" targets, but will enhance deep larger targets. DEEP sounds awesome....but more times than not it will just make your GPX noisier.
Do a quick ground balance, and then hold the coil in the air. Is it quiet? if not do an autotune. This will get you in the ballpark of where you need to be, and if you have to make adjustments to the freq later it usually only requires moving a number or two most times. Don't worry if it annoys someone for a few seconds. They will get over it. You shouldn't be on top of anyone anyway. (Quick note....If you are too close to someone and even if you cant hear will STILL affect your performance and depth. This is easily demonstrated! ). Most of the time if you see me in the field I will try to get as far away from everyone as I can. That's not always possible but its no fun fighting interference if you don't need to. And I still occasionally stumble over something.
Once you get the RF interference under control, sweep the coil a few times. If its quiet in the air but noisy swinging you still have it too hot, (its seeing the ground) BUT if you start out like I suggested (tame settings) thats unlikely. thumbs up.
Last but not least........set your stabilizer (should always be the last thing you set) properly. Not sure what the factory default on the 4500 is but its 5 on the 4800. Turn it up till you can just hear variations in the threshold, and then back it down one number. Be aware that if you crank it up, it will make targets louder but it will also hide deep faint targets. Same with your threshold. Some guys have it fairly loud....but I prefer to have mine just in the verge of being silent. The machine will be much quieter and your battery will last longer.
IF the machine is solid and stable, THEN you can experiment with more aggressive timings.
Another thing that comes to mind is that in real busy areas where there is a lot of debris, nail pieces and other undesirable targets (you find these a lot in new sites) do NOT overlook Enhance. It will knock out a lot of the tiny annoying targets and give your brain a rest in VERY "busy" areas. I use enhance a LOT. You will lose a bit depth, but you will still get down there. It sounds a bit different but is a very useful tool in your arsenal.
The GPX can be as complicated or as easy as you want it to be. Take your time. Experiment a bit over a known target away from everyone else. You may lose a few minutes of hunting time, but its a few minutes well spent. Be aware that some settings do not "carry over" to other timings. Some hotter timings will make good targets sound like bad targets. Here is a real biggie: Do NOT expect all good targets to produce clean high or low tones. Many many many good targets will produce a combination tone, like a warble or gobble. LOTS of great buttons will do this. Some co located targets will do this. Some plates will do this. What I generally look for is REPEAT-ABILITY. Swing over the targets from two directions. IF it sounds the same, DIG IT. Actually, that is a good way to ID certain kinds of iron as well. Iron and nails sounds will almost always change when circling or swinging over two different axis.
Ground balance often, especially if your going up or down hill.
I strongly suggest that if you have been messing around with the settings and are unsure how things are, do a factory reset before you begin.
Best advice I can give you is to chill, slow WAY down, experiment and get to really know your machine. The better you know it the more tools you will have to correct things when they go south.
There isnt much you can do to mitigate interference from power lines except get an anti interference coil. There are a peculiar critter, but they DO work.
Hope this helps you a bit at least.

Edited 1 time(s). Last edit at 01/12/2018 06:35PM by htcampbell2.
Re: Why PI Detector at DIV
April 08, 2018 08:35AM
Thanks for sharing. I really appreciate the knowledge shared. Happy digging.

Private George Washington Gaither
10 VA Infantry Co C
My Great Great Grandfather
Re: Why PI Detector at DIV
January 13, 2018 09:45AM
Updated the main post to include Streak's invaluable GPX setup advice.
Re: Why PI Detector at DIV
January 09, 2018 04:39PM
Always a good article to revisit
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It's been awhile now, but.....
December 01, 2017 05:09PM
I have attended a couple DIV's and used my Troy's Shadow X5 and done well at each hunt. Forget the exact count, but dug about 80 bullets, half a belt plate and several buttons surface hunting along with some artillery frags at my last hunt. Tried the hut digging and found some other nice relics to include a comb and a nice complete gin bottle. Also did not have to worry about water proofing my machine or coil and it runs on one 9 volt battery. I'd pop a fresh one in each day, although it was not necessary.

Edited 1 time(s). Last edit at 12/02/2017 11:26AM by Mike(NC).
The X5 is my #1 VLF machine for hot dirt. thumbs up
January 15, 2018 12:03PM
It LOVES deep lead, and you can actually tell nails and such from bullets after a while. Not quite as good on deep brass, but it will hear it.

"Democracy is two wolves and a lamb deciding what to have for dinner. Liberty is a well-armed lamb."
Re: Why PI Detector at DIV
December 01, 2017 02:32PM
I have hunted culpeper several times with VLF and PI machines. Some of the soil is so hot if my only choice was a vlf machine I would just stay home. There are exceptions however, the nautilus and whites blue and gray vlf machines did and still work for hut/pit hunting.
I use a big box tdi because that's what I can afford. They love brass as mentioned before. While hunting side by side with skilled Gpx users there is no comparison. The gpx will flat out hear signals the tdi could not. I have no experience with other PI detectors so can't speak for them.
I have used a dfx (hundreds of hours of experience) in normal soil and when used in hot soil you MUST hunt in all metal mode. Discrimination will get you nowhere there. If you place a button under 1" of hot soil it will sound like junk! This is why you must dig all signals with a vlf machine.
Great information
November 27, 2017 08:35AM
Always enjoy reading history about the DIV sites.

One thing I would add is that considering the outlay of funds to participate in DIV: hotel accommodations, entrance fee, travel expenses, food, souvenir clothing and such (all well worth the cost), why not give yourself the best edge and spring for a Pulse Induction (PI) machine.

I brought both my AT Pro (VLF) and XP Deus (VLF) as backup machines and tried them after the hunt. The machines were falsely telling me there were targets every few feet. The ground is so heavily mineralized.

I used a Whites TDI and it punched through the curtain mineralization so well, the difference was night and day. This just provided the extra incentive to I needed to purchase my GPX.

I don't think we're supposed to mention suppliers by name, but there is a civil war relic shop in Ashville VA which also sells detectors. Run by a man named "Rand".They gave me credit on two of my machines when I was trading up. Don't know if they still do that or not. It was three years ago.

Bottom kind to yourself and get a PI machine of some sort.

Happy hunting and best of luck to all.

Edited 1 time(s). Last edit at 11/27/2017 08:38AM by IDignVA.
Re: Great information
November 29, 2017 12:07AM
The relic shop is in Ashland , Va..

Also anyone using a GPX near power lines , don't hesitate to use :"Cancel Mode" to eliminate noise. Relics still can be dug even though you will loose some depth.
Re: Why PI Detector at DIV
November 21, 2017 03:21PM
Excellent information. Thanks for taking the time.
Re: Why PI Detector at DIV
November 19, 2017 08:26PM
Thanks for the information. I enjoyed reading in order to learn more about machines and digging in VA. There is always something to learn.
Re: Why PI Detector at DIV
November 18, 2017 08:10PM
Has anyone tried hunting with a VLF in all metal in the red dirt and not worried about using disc. I know you would have to dig everything. Was just wondering how deep the all metal mode would go compared to one of the popular PI machines. Mark
Re: Why PI Detector at DIV
November 18, 2017 11:05PM
In all metal mode you can reliably "hear" down to about 6 inches on average with the Deus. That just is a repeatable change in the threshold regardless of target type (ferrous or non-ferrous) and you won't know until you dig. Haven't tried other machines extensively in Culpeper soil. The conditions are so variable I have seen a 3-ringer "disappear" at 4 inches in an open hole and I have deteted and dug a three ringer at 7 plus inches. The mineralization conditions vary signficantly, so consistency with a VLF is practically impossible vs. the PI machines which don't much care, although sometimes the ircon reject on the GPX's "overreacts" on brass targets when there is high mineralization so dialing it down to 4 (from the typical setting of 7) helps with eliminating false ferrous rejects but of course you will dig more iron.
Re: Why PI Detector at DIV
November 14, 2017 08:08PM
Lots of good info there Hugh,,,I would add that at the last DIV 38 the woods were mostly good brown soil and a VLF would have worked just fine and Many DIV events have Woods .The entire lower fields of Coles Hill were brown dirt down by the water as well. Its that red soil in the fields and the hills that the best choice is the PI machines .If DIV ever has a hunt away from the Culpeper area like towards Chancellorsville, Spotsylvania, or farther towards Fredericksburg the VLF will work just fine. Since the location of the hunt is usually not reveled before the pre hunt meeting having a back up machine plan is a good idea . For the most part DIV events are notorious for the red dirt and yield lots of relics overlooked by lessor machines.metal detecting smiley I think the biggest headache is EMI from power lines and other equipment in the field and there are a lot of helpful tips out there for that expecially for us GPX users. Not sure how much you have learned about limiting EMI but all the comments on a post dedicated to that topic could help a lot especially for those new to the GPX that are making annoying mistakes in the field.
Re: Why PI Detector at DIV
November 14, 2017 11:04PM
Good points, Chuck re: the woods. Ironically, my best find at 38 was a the Parrott shell at 1.5 ft. that I found in the grass near the parking area with the Deus (VLF) and I found a little brass in the woods with it too. Also found a dropped live Winchester (modern) cartridge and several .38 casings, too as well as a brass fuse that I still need to positively ID. Regarding EMI mitigation, another good point, I think deserves a plug for the "Tools of the Trade" forum on The Treasure Spot and just jump right in and read the GPX thread. Plenty of great info there.
Re: Why PI Detector at DIV
November 07, 2017 03:14PM
Thanks for the excellent write up! Read several times and learned more each time. Well done.
Great write up! Full of information that will help any DIV'er. (n/t)
November 05, 2017 09:28AM
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William E. Colston Co H 1st Maryland infantry CSA. Wounded in the groin at the Battle of Cross Keys. Volunteer Aide to Gen Isaac Trimble at Gettysburg. Volunteered Mosby's battalion. killed Jan 10, 1864 during the night attack of Coles camp on loudon heights.
Elias Falls Co C 27th South Carolina infantry
George Henry Co H 27th Mass infantry killed in the battle of Roanoke island Nc
Re: Why PI Detector at DIV
November 03, 2017 08:47AM
Great summary and info from everyone. I have an old DFX and have been hunting around Culpeper for 12 years with it. More and more I think it's time for me to retire the old girl and make a leap to the GPX. Just wondering how many things I have passed up over the years.
Thanx Hugh. Great write up for all DIVers (n/t)
November 02, 2017 10:51PM
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Re: Why PI Detector at DIV
November 02, 2017 05:01PM
Thank you HT pretty much answers many questions I had as a Newbie to DIV
Re: Why PI Detector at DIV
November 02, 2017 05:14PM
Very glad you found this information useful. That was the purpose for my post.

Hugh Campbell
Re: Why PI Detector at DIV
August 29, 2017 12:34PM
Good info, planning on getting a GPX 4500 soon so I can get ready for the Spring
Re: Why PI Detector at DIV
August 10, 2017 06:49PM
Great post... I'm disappointed that I can't sign up due to a conflict but I'll take your advise to heart if the other dates work out for me.
Re: Why PI Detector at DIV
August 10, 2017 08:15PM
Thanks. Good luck to you for the next hunt.

Just wanted to mention an additional point that often gets overlooked: Knowing your detector well can sometimes trump technology. By that I mean, that when you only have 3 days to hunt and you are a wizard with your MXT or AT Pro based on hundreds of hours of swing time - you MIGHT be better off just going with your familiar detector rather than taking the time to learn a completely new machine like a GPX. Now a GPX doesn't take long to learn, it is just a tone machine (no vdi) and you can get the hang of it pretty quickly to ID low and high conductors, but it will take time to learn the nuance between a low conductor and a broken square nail. Also, the key to the GPX is proper setup of the various adjustments. You need to decide and choose which way your are going to go. If you don't have much experience with your vlf machine, then I recommend going ahead and renting a PI for the hunt and using that machine because either way you are on a learning curve and you should chose the superior technology. Hope that makes sense. Happy Hunting!
Re: Why PI Detector at DIV
November 05, 2017 09:06AM
This is exactly what I wanted to hear!! Thank you very much. Can't wait
Re: Why PI Detector at DIV
November 02, 2017 11:04PM
Excellent point. Knowledge and experience can trump technology. I showed up to my first DIV with a GPX that was totally new to me. Luckily, I had some great friends that took me under their wings and helped give me a crash course and then stayed by my side throughout the 6 days of hunting.

Good friends can help overcome inexperience.
Great post. I started with VLF then went to PI....
August 10, 2017 07:49AM
I started my first DIV with a White's MXT a few years ago. Then a lot of people were using the TDI and only a handful were using the GPX as it was pretty new. I found a few bullets and buttons once I realized I had to dig everything. I learned right away the tones and VDI that I was used to in Tennessee were not the same in Culpeper. I mainly hunt by sound anyways but bullets back home give a high tone. The only way I could get a high tone on a bullet was to lay it on the ground. Once in the dirt it is a low tone. On the last day when I saw what others were finding with the PI I knew right then that I had to get a PI so I bought a TDI. Next DIV my finds increased a lot with the TDI. Now when they say it is a button magnet they are not kidding. Brass gives a high tone. Bullets have a distinct low tone very close to iron but there is a difference. Since then I have borrowed a Garrett ATX and GPX to hunt with. Both are better than the TDI. Now I just purchased my own GPX and I am so excited. The PI machines are the way to go if you want to dig a lot relics at DIV.
Re: Why PI Detector at DIV
August 09, 2017 11:07PM
Thanks for the article, good information
Very good write up! (n/t)
August 09, 2017 10:53PM
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Re: Why PI Detector at DIV
August 09, 2017 10:13PM
Thought I would bump this thread up for the benefit of the newer folks who get invited to DIV 38.
Re: Why PI Detector at DIV
January 18, 2017 07:49AM
All -

Thanks for the comments and kind words. Hope many find it helpful and more importantly reduce some of the angst for new DIVers. I plan on making some corrections and tweaks but glad there is no gross misinformation id'ed so far.
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Great write up. I think you covered it.smoking smiley (n/t)
January 11, 2017 03:00PM
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2 thumbs up . a must read for everyone.
January 11, 2017 09:56AM
that is probably the best write up and discription ive read in a while..great job
That About Sums It Up...Great Information! (n/t)
January 09, 2017 02:28PM
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Re: Why PI Detector at DIV
January 09, 2017 06:49AM
A nice write up chocked with good information for the new or veteran DIV participant.
Re: Why PI Detector at DIV
August 10, 2017 11:07PM
How would the Garrett Sea Hunter II do as an entry level PI detector for the DIV? Thoughts please...
Re: Why PI Detector at DIV
August 11, 2017 12:30AM
Not real well because you can't ground balance it. Not all pulse machines will work. You have to have the ability to ground balance

"Life's tough......It's even tougher if you're stupid."

-John Wayne
Re: Why PI Detector at DIV
August 27, 2017 12:05AM
I too have thought about trying the Garrett Sea Hunter at DIV. I used an AT Pro at DIV XXXII and found quite a few bullets in the woods. I now also have a new Sea Hunter. I have seen comments that it will not work because it does not have ground balance, but it works great in the salt water and wet sand. I would think it would work in the red Culpepper soil. May give it a try.
Re: Why PI Detector at DIV
August 27, 2017 10:22AM
The problem with using the Sea Hunter in Culpeper soil is not so much that it does not have ground balance. It is that it has a fixed balance that is optimized for salt conductivity elimination and low iron conditions and a mono coil that does not support discrimination (not that the trash elimination adjustment is just a pulse delay adjustment, not true iron rejection/discrimination which is not supported by any mono coil). The mono coil, which is great for depth under ideal conditions such as sugar sand salt beaches with no mineralization, suffers just as any concentric coil would with depth and noise under even mild to moderate mineralized conditions. The Sea Hunter is a great salt and wet salt sand beach detector but it is not a great black sand (i.e., mineralized black beach sand) detector for that reason and will similarly have issues in Culpeper which is off the charts on mineralization and hot rocks. The targets in Culpeper would likely have to be super shallow or surface for detectability and likely the noise alone may drive you nuts. Unless you can stick a DD coil on it (dunno if you can switch to DD coils or if it is even compatible with a DD), frankly, IMO you would be better off with the AT Pro simply because you could stick a huge DD coil on it (even the stock AT Pro DD would work better than the Sea Hunter mono coil). Bring the Sea Hunter along and experiment with it if you have the cargo space and the time test it out, but be sure to bring your AT Pro too. There is a reason why 80% or more of the folks out there are using the GPX, ATX/Infinium, or TDI model PI detectors. Those detectors, especially the GPX and ATX/Infinium are primarily designed to be gold prospecting detectors to ferret out mid conductors (gold nuggets) in highly mineralized soil. So they just happen to also be able to ferret buttons, brass, and lead deep out out of the Red Dut of Culpeper just as well as gold in the Australian outback. Heck, some folks don't even use detectors at DIV and kill it with a spring probe (John makes these himself), shovel, research, intuition, and determination. Good luck.

Edited 2 time(s). Last edit at 08/28/2017 10:01PM by htcampbell2.
Re: Why PI Detector at DIV
August 28, 2017 09:52PM
Thanks for the reply. I now have a better understanding of the Sea Hunter's limitations at Culpepper. Just used it for the first time last week at the Gulf Coast, it is a deep seeking and fun machine in the surf!
Re: Why PI Detector at DIV
August 28, 2017 10:02PM
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