From WoWWiki
Pathfinding is a hunter talent in the Beast Mastery tree. It has two ranks.
Rank table
| Rank | Aspect Speed increase | Mounted Speed increase
|
| 1 | 4% | 5%
|
| 2 | 8% | 10%
|
This talent does not stack with other movement increasing abilities or trinkets.
The mounted movement speed increase is not directly added to your speed. in order to find actual mounted movement speed you need to add your unmodified speed (100%) plus the speed of the current mount (60%/100%/280%). This will give you the "real" speed at which you are moving. Then divide that by 10% (12% for regular ground and flying, 20% for epic ground, and 38% for epic flying). You then add the result to the base mounted movement speed, being 60%, 100%, or 280%. A regular ground and flying mount moves at 72%, an epic ground mount moves at 120%, and an epic flying mount moves at 318%.