JAB - I believe you tune the 5th string to G and do not spike. Then you tune it down to accommodate, F#, F, E - tune up of spike to go to A, B etc. In short, you tune to a G tuning with the capo at the third fret and the 5th string open at G.
In short, you tune to a G tuning with the capo at the third fret and the 5th string open at G.