Just starting out with a cortes,Have a question for all of you cortes pro's.After ground balancing the unit,and switching to disc.mode.When runnign the machine it seems the display constantly stay's iron and/or foil.Is this normal?It does move to the approiate location when a good target is located.Just seems funny that it always stays in iron/foil,and have yet to see it say "discriminate" on the display when you turn it on,or when your hunting......Thanks in advance for you reply's..............kd