Sorry if this isn't possible, I don't really know anything about making addons. I was just wondering if it's possible to make an addon that would show something like a circle around your arrow on the minimap representing the range of tracking. To further explain: we all know that with tracking on and minimap zoomed all the way out you won't find herbs that are all the way at the edge of the minimap, but it's hard to know the exact range. If there was some sort of indicator it would be a lot easier to do efficient circuits of areas when collecting herbs.
Tracking's range is the same as your visible range in the 3D world, at that depends on a number of factors (lag, computer speed, movement...). Basically, if the <whatever> has drawn in on your screen, it'll show up to the respective tracker on the minimap.