We are huge fans of Shenzhen. One of the main reasons is the Hua Qiang Bei district. It is a compact area (5 square blocks) of buildings that are stuffed with shops and stalls selling all measure of electronics from components to computers. Navigating this Willie Wonka'esque array of electronics shops/stalls was overwhelming so we came up with a system. This system allows us to navigate the district reliably and return to shops we like without getting lost. This sounds like a simple task, however the scale of the area means that this was no mean feat. We're posting all the details here and hopefully others might find it helpful when exploring.
All the details (including a google map layer can be found here):