Can anyone help I need a bit of reassurance .I'm finding that in LT. HT .FC .I seem to lose the iron noise in the ground .lack of nulling in iron infested areas in auto , ground coin seems to be the most informative .I'm spending a lot of time switching from auto to manual to keep up a steady gap in the nulling .I would like to hunt in Fe coin as manly dealing with iron .auto is mostly around 17 but I can run in man up to 28 with no problem .also running very little discrimination many thanks