It seems to be easy to go accessory crazy with detecting.  I think many times people who are not able to spend a lot of time detecting, instead start buying detecting accessories.  Maybe these detectorists are not having much luck and think a new machine or a new coil is just the thing they need to make better finds.

When it comes to coils, this is a tough one to answer.  Certainly for different types of detecting, having a smaller or larger coil can be an advantage.  But 90% of the time the stock coil will give you good results for coinshooting. 

There are two main types of coils available, concentric and double-d (DD).  Knowing which type your detector uses helps you understand how to get the most out of it.  A concentric coil puts out a cone-shaped field (shaped like a O), the DD field is more like the "center slice" of the concentric (shaped like an I).
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