It's not posible for addon's to find out when a node is in the area ONLY when you mine it. I'ts to stop botting (or make it harder). You need to keep an eye out... I use Sexymap's HUD which moves the minimap dots right over the screen (you lose the minimap while it is up but it works really well!) also this only works with gathermates nodes and not Carbonites i'm afraid BUT it DOES work with Breadcrumbs(shameless plug!
) and Routes which makes it ace for mining.
Regards,
Zas