The nanomap is designed as an iPhone icon. It helps the experienced passengers find a transfer within the Circle Line at a glance:

Moscow Metro nanomap

Imagine riding the green line from Belorusskaya towards centre with an intention to change for the red line. You instantly see that you’ll need to skip two stops, then change.

The elements of the map retain legibility even on the old non-Retina screens:

Moscow Metro nanomap

To use the nanomap, open this page on an iPhone, tap and select “Add to Home Screen” . Or, even better, do it from the full map’s page for the icon open it.