English: Handy charts for memorization of relative root positions, and fretboard note names for Perfect Fourths Tuning (aka "P4 Tuning" or "All Fourths" tuning), specifically for the tuning EADGCF. The bottom two fretboard diagrams illustrate a simple technique to memorize the notes on guitars with this tuning. First, focus on these "Clusters-of-Four" Natural notes, E, F, B and C. Once you have a good feel for the locations of these clusters, you'll notice that the remaining Natural notes (G, D, and A) form a column, connecting the clusters. In practice I found the app "Fret Tester" to be perfectly suited to practicing and memorization using this technique. Further details are found in the instructions at the bottom of the image.