Prowling practice
From Fallen London Wiki
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From: Feline Expeditions into Shadow
Let them show you the fastest paths through London and Parabola.
Game Instructions: If your Shadowy is not at its cap, this will gain a significant number of change points.
Unlocked with 
450 x Sightings of Parabolan Landmarks
Success
A detailed cartography
[...] Only cats know the fastest routes between one point and another, slipping from Is to Is-Not [...] From the Smoking Shore to the Upright Sea, the fastest way runs through the Duchess' bedchamber. [...] Keep close to your guide, and remember everything you see.
Shadowy is increasing… (+250 CP, up to level 200 + 
Shadowy Gains)
You've lost 450 x Sighting of a Parabolan Landmark
