| i'm not quite sure, but i believe it's something like this: with most basses, there are at least 20 frets. if you follow the one finger per fret method, the first position would start at the first fret(index finger for first fret, middle second, ring third, pinky fourth), the second position would start from the fifth fret(with fingers placed in the aforementioned order), the third position begins on the ninth fret, and so on. | 
