You can also purchase expensive Legendary Animal Pheromones from Davenport to further pinpoint their location.
The map is a rough guide for where the legendary animals will appear and will be upgraded as you progress through the role.
From here on out, legendary animals will start to spawn in the open-world. Once you hit Rank 5, Davenport will provide you with a Red Dead Online Legendary Animals Map accessible from your radial items menu.