I have dug plenty of phantom holes as well Trev, sometimes I wonder if I keep digging I'll find a mountain bike or something equally as odd buried 6 foot under.
I'm with hAyyoUinAU, I have got some odd signals from upright coins, numbers being off etc. Turn on it 90 degrees and disappearing signal for one swing strong the next. A $2 coin had me so confused one day in the park down at the end of my street. I knew there was something there turned out it was upright almost 9" down. I was happy to find it but at the same time thought surely it had to be something much nicer for the effort.
Another issue being coke (and slag balls) in the ground, for some reason here in Lithgow the numbers on that crap are oddly high and they are confusing when they give a solid tone/number.
I'm with hAyyoUinAU, I have got some odd signals from upright coins, numbers being off etc. Turn on it 90 degrees and disappearing signal for one swing strong the next. A $2 coin had me so confused one day in the park down at the end of my street. I knew there was something there turned out it was upright almost 9" down. I was happy to find it but at the same time thought surely it had to be something much nicer for the effort.
Another issue being coke (and slag balls) in the ground, for some reason here in Lithgow the numbers on that crap are oddly high and they are confusing when they give a solid tone/number.