KeyStrings...The Idea is Simple:

1.  Use the note code from the piano.  The code is set by the groups of black keys:  a group of 2 and a group of 3 black keys.  Each white key note A through G is found by where it sits relative to the black keys.

2.  Adapt the note code to the guitar fingerboard.  EACH STRING on the guitar is like a keyboard of notes, with each fret space being a key.  Use position markers with five special shapes to mark the black key notes ALL ALONG EACH STRING.

3.  Now you can SEE THE NOTES on the entire fingerboard!