I do not understand why a pinpointer would affect the coil when it is off??? Is there a constant and therefore never actually off signal from the pinpointer? Or, does the transmit on the coil induce a signal that the detector then recieves? I never take my pack off and leave it anymore, "cause i ain't smart enough to pick it up before I wander over the next hill-much to my embaressment! Thank you for your always complete and thoughtful replies fred