G major begins on the one string the other keys treat as a helper: the open reentrant G itself. From there the map never repeats a string — G, A, B, C, D, E, F#, G lands alternately on the fourth and first strings the whole way up, a perfect ping-pong that keeps every step ringing under the next. If F major is the music box, G major is the version you can start without fretting a single note.
Reading the map
Both open strings that name this page’s sound — G and A — are scale tones, so the first two notes cost nothing. Then the pairs climb in parallel: B at the G string’s fourth fret answered by C at the A string’s third, D at the seventh answered by E at the seventh, and the top pair — F# at the eleventh, G at the tenth — closing the octave up the neck. The F# is the key’s single sharp and the map’s highest reach; it is also the note that tells you instantly whether your uke’s intonation is honest that far up. (Compare the conventional G major position maps to see the same notes stacked into one hand position instead.)
Practicing it
The paired layout suggests its own drill: play the scale as it stands, then play it in fourths — each fourth-string note together with its first-string answer (G with C, B with E, D with G) — and the map turns into instant two-voice harmony, all of it ringing. Strummers who already live in G will feel the payoff fastest: the key of your three favorite chords now has a melody register to match. When the top pair feels secure, the A minor pentatonic map reuses exactly this region of the neck.