Written by the TreasureGuide for the exclusive use of the Treasure Beaches Report.
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| Manticore 2D ID Map Display |
Yesterday I showed four cobs that were found on a Treasure Coast shipwreck beach. I talked about clues on the coins that helped narrow down the date range of two of those coins. Since I had them out, I decided to check the conductivity readings that the Minelab Manticore gave on those coins. As you might recall, one coin was larger (a 2-reale) while the other three were small half-reales. I also included a dime in my conductivity tests just for comparison.
Here are the conductivity numbers. I got for the dime and each of the four reales.
The dime produced numbers right around 78.
For the two-real,, the Manticore gave numbers centering around 47.
The largest of the half reales gave a reading of about 41.
The next one gave numbers right around 29 and 30.
And the very smallest rang up around 9 - 14.
My first takeaway is something we already knew - size matters.
My second takeaway is that reales can give any of a large range of conductivity numbers. Smaller examples give smaller numbers.
While I had the detector out in the yard, I decided to look at the Manticore's 2D ID Map feature (Sample display shown at the top of this post.)
The 2D ID Map on the MANTICORE is a feature that visualizes detected targets by plotting them based on their conductivity and ferrous properties...
The ID Map displays detected targets as a trace — a dot or smudge — that indicates the target’s properties..
Horizontal Axis (0–99): Represents conductivity, with lower values on the left and higher values on the right.
Vertical Axis: Indicates ferrous content. Targets with more ferrous properties appear towards the upper side of the map, while less ferrous or non-ferrous items trend toward the lower side...
Each detected object generates a trace, whose position reflects the object’s properties. The opacity of this trace changes with signal strength, allowing detectorists to gauge target size and depth intuitively.
Due to various circumstances, I haven't used the Manticore a lot yet and consider myself a beginner when it comes to the Manticore, but I've had very good results with it in the field and am impressed by several aspects of its operation. I am especially interested in learning more about the 2D ID map feature. It seems that with some practice I will be able to use it much more effectively, although, as remarkable as the capability is, I'm not sure I will use it extensively in the field. I will explore the effectiveness of different decision strategies in future posts.
I also found that there is a knack to "painting" the object. Sweeping the coil in one direction will show part of the image, but multiple sweeps from different directions adds to the information obtained about the object.
For example, I took a bracelet and put it on the ground in the form of a circle. Moving the coil over the bracelet left to right, produced a readout that looked like two objects. One side of the bracelet was shown as one object, then there was the opening, and then the other side of the bracelet appeared as a second object. By additional sweeping you can gather more information about the object. However, there is a point at which taking additional time to gather information to assess the nature of the object can take more time than simply digging the object and looking at it.
I'm feel confident that with some good practice I could learn to use the ID map very effectively. At this point, I'm just giving my initial impressions, which are very positive. My congratulations to the Minelab engineers.
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From Sedwick...
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| Surf Chart from SurfGuru.com. |
Looks like we might get an increased surf in a few days. The tides remain fairly big.
I expect to be doing some posts on decision theory in the new future.
Good hunting,
Treasureguide@comcast.net