TruePurple
Cowpoke
It seems to me that simply being able to find things easier is insufficient (and vague arrows does not seem very informative either) What if Tracker also gave you extra stuff, like directed you to resources you could not even see/collect if you didn't have it? Bonus resources from the skill could be highlighted to indicate such. Not sure what percentage of bonus stuff, but sufficient to counterbalance the very good botanist.