Determining the site of a fire with the F75/T2 ?? Can someone explain this?

I've read in the manual of both machines that you can use the FeO2 meter to determine the location of a campfire or a house fire and draw isolines to map a property. They don't include enough information for me to understand how to do it. Can someone explain it, like in "dummie language" with some examples of what changes I might find in the field while trying to do this. What do higher or lower numbers mean once I have a general baseline.

I have one property that has produced many CW and other relics, even a WWI cast soldier that likely belonged to Bobby Jones, the golfer. The first home known to be built on the property was in the mid 1830s, it burned after the civil war. Next an attorney built an office closer to the road, it soon burned too. In 1906 Bobby Jones aunt built a home on the property and it still stands. Bobby is the only child known to have ever spent time there, at least in that time period. I have display cases full of minnies, carbines, .44s, buttons, a US plate, even a sutler's token (DJ Church)... just all kinds of CW relics. Lots of small tack buckles and interesting iron too.

I have hunted it for several years now and the finds don't come as often but they still come. I found a broken but whole Burnside a couple of weeks ago.

I am wondering if it might help me to map the place or at least maybe locate where the original house stood, if I can tell where the fires were.. but I don't know how. The ground changes from one end of the property to the other. It is a hill. One end has softer deeper soil and the other end has rocks all over and hard clay. I found a good many eagle buttons on top of the ground in that area.

Any tips will be appreciated but especially how to figure out where I fire was. Please assume I know nothing about it because that would be about right. I can read the meter and over there is is usually 0.03

Thanks for the help,

Julien

From what you are saying.......it sounds like the TYPE of dirt 'changes' quite a bit on this property.....from one area to another. By virtue of this alone..........this will skew the Fe3O4 measurements; subsequently invalidating the magnetite datum/baseline.
It would be my recommendation to flip the unit to all-metal mode.......and find the hottest 'iron hot-spots'..........and you are done! Structural perimeter delineation is VERY audibly discernable. (This is the old-fashioned method).

Thanks Tom, it does change a lot. I have always hunted in disc with both my T2 and my F75, Now that I have an LTD I am really leaning toward hunting in BP and All Metal. Especially after watching a couple of recent videos about the F75.

I imagine you are familiar with Kennesaw. They are cutting a walking trail just north of Barrett Pkwy, alongside a creek. A friend an I went there the other day, it was trashy and the ground was changing a LOT and really fast. In disc the F75 LTD was falsing like crazy, I was getting a lot of 90s hits. I was running BP, disc 6 to 15, sens 50 and still falsing. Right before we left I left it all alone and switched over to AM and it immediately stopped falsing. I was getting 10 to 20 times more sounds in disc. I think I was running disc in 2F.

One other place I tried the LTD with the small coil, up on Brushy Mountain. I ran BP, AM, sens=99. It was so quiet I had to check a couple of time to make sure it was on. I didn't hunt long but I did dig a handful of old shotgun brass that could well have been relics.. so I was happy with it. It is different from the F75 in BP and CL, really different. I want to go up there and to the place in Cartersville where I wanted to find the fire sites and hunt in AM watching the bounce and digging signals I wouldn't normally dig. I will let you know how it goes, especially if I make many new finds.

Tom, thanks for all your help!!

Julien

Sure, keep me posted. Yes.......in tough ground, you can surely see the attributes of the all-metal mode....and can really appreciate the VDI whilst in all-metal mode. In the ID mode......the slightest ground change .. is a 'signal/target'. In the AM mode.... it is only a slight quiver.