It consists of making a cardboard chart or "board" with fret positions and notes on it, slipped under the strings to show you where the notes are, this helps to gain knowledge of the fretboard and learn new tunes as you can see where to get chords and then figure out how to move between them.
Once this is learned the "board" is removed and memory takes over ( muscle or brain the choice is yours )
Lord Donald thought it a good idea in my last post so I will add pictures to show what I am talking about, besides a picture's worth a thousand words
I hope this helps someone, as it's helped me to understand different tunings on non pedal steel and you can see at a glance the relationship between them, the cereal packet I used has provided the best cardboard yet, with the usual disclaimer on the product contained within
P. S.
Don't use a razor blade when cutting cardboard on the worktop as it leaves nasty marks

