A short interlude that rounds out your navigation toolkit before the major scale. Module 3 let you find everything by geometry alone, starting from a single root; here you add two complementary skills. First, landmark navigation — learning notes by name so you can jump straight to a tonal center anywhere, one note at a time. Then intervals on the fretboard — reading what each note is relative to the root, mapped right onto the rectangle and stack. Together with the shapes, these are the three legs the rest of the course stands on.