Compare Garrett 9×12″ Concentric Coil with Stock 8.5×11″ DD

Ok, just viewed an air test of the Garrett 9×12″ concentric coil vs the Garrett Stock 8.5 x 11″ Double D coil. He used the two coils on the AT Max. The test was done  on an individual’s metal detecting channel on Youtube. Full disclosure requires me to let you know that I like most of his videos and being well filmed and an accurate representation of the metal detecting hobby with little or no hype.

Now here is where I fault his air test. The air test shows the concentric coil delivering better results on deep targets. Well that is a given due to the different coil designs. The DD coil will deliver a full 11″ swath at max depth whereas the concentric coil (using a cone pattern) will deliver only an inch or so swath at maximum depth. So now lets figure in the hunting time looking for deep objects. It is 11 to 1 ration in favor of the Double D coil. So a 2 hour hunt of a specific area with the  Double D coil will turn into to a 22 hour hunt using the concentric coil.

On the upper beach or volley ball court or areas where the targets are only 2″ deep, then the coils are basically equal. On a search for deep coins or jewelry, you could not possibly consider using a concentric coil.


Garrett Pro Pointer AT refresher notes

We sometimes just think the pin pointer a simple device. In fact we should remember the Garrett Pro Pointer AT has more than just an off and on switch. Watch this video again and see how you can apply the features to speed up your target recovery time.  One of the things that I use the most is using the pin pointer to determine the size of the object by tracing the outline of the target on the ground. This works for your targets that are 2-4 inches deep.