Today I present two related edges based around the Tracking skill; edges similar to these may exist elsewhere, but I haven’t seen them.

Bloodhound
Requirements: Survival d6, Tracking d6
You know a specific type of terrain (mountains, swamp, woodlands, etc), like the back of your hand; you receive a +2 bonus when tracking someone in that terrain.

Shadow
Requirements: Stealth d6, Tracking d6
You can use Tracking to trail someone in an urban environment with little chance of being noticed; your mark suffers a -2 penalty to Notice rolls to discover you when you are following him.