First, The Term For The Buried Object That Just Has Been Detected By A Metal Detector Is Called The Target.

Targets With Large Flat Surface Area, Buried At An Angle In The Ground,  Emit Their Magnetic Signal Off On An Angle In Line With Their Flat Surface, Giving A False Pinpoint Location At The Surface Of The Ground!   This Results In The User Digging Down Next To The Detected Target And Missing It!   Wasting Value Time That Could Have Been Scent Searching More Area!  The Worst Part Is When You Finally Discover The Detected Item Was Hear The Top Edge Of The Hole You Have Been Digging!   AAhhhhhh!

For Those New to this hobby, take note of what happens everyday to treasure hunter hobbyist.   Invest in a good strong Metal Detecting Recovery Trowel, a Tool/Treasure Belt Pouch, a Brass Probe, And, A Electronic Target Pinpointing Probe!