What does it do ? In a few words, it "links" all the mining nodes on your map and minimap and shows the shortest route between them. That's VERY useful if you want to mine efficiently, especially in Outland with an epic flying mount.
What do you need ?
1. Cartographer
2. Cartographer_Mining / Cartographer_Herbalism / Cartographer_Fishing / Cartographer_ExtractGas depending on what you want to gather.
3. Cartographer_Routes
4. Anything else you need on wowace.com
Setup
It's fairly easy to get it working if you don't really want to tweak it.
1. Extract everything in your /Interface/Addons folder as usual
2. Launch the game, open your map, and go in the Cartographer menu
3. Pick the route submenu and select add. Chose all the nodes you want to "track" on your map and minimap, and create the route. (Screenshot #1)
4. Voila ! You've got an impressive path between each node ! Impressive isn't it ? Yeah, not really because it's not readable in its current state. (Screenshot #2)
5. Hopefully, you can optimize everything, select the route you just created in the submenu and take a look at the "Optimize route" part. Depending on how you want to spend your resources (read the tooltips in game) you can select Background/Foreground optimization, and even add a few extra optimizations. (Screenshot #3.jpg)
6. Get yourself a coffee while it's working.
7. Enjoy your easy gathering ! (Screenshot #4)