Eagle Vision is a special ability in Assassin's Creed III. It lets you sense certain people or objects.
You first use Eagle Vision in the mission A Deadly Performance inside Theater Royal to find a person that Reginald Birch is looking for.
Eagle Vision Color Key[edit]
Red: Enemies, Blood
Blue: Allies
White: Hiding Spots, Information Sources
Gold: Persons of Interest
How to use Eagle Vision[edit]
L (xbox) or L3 (PS3) activates the Eagle Vision, R locks in on target L in xbox controller is push left joystick to down
A Deadly Performance Gold Target[edit]
See screenshot below for location of Gold Target: