I keep my charts simple - permanent OHP pens to draw the track (non-permanent are easy to rub off but tend to leave excellent stains on clothes and wipe off all too easily just when you don't want). I put a perpendicular mark at each checkpoint or turning point and give each one a number, and then write the corresponding number against the turning point on the PLOG.
Where there is no turning point I select a notable landmark/VRP at around 20 miles or roughly ten minute intervals. So if I get lost I should never be more than ten mins. from where I knew I was, or at least where I thought I was, or wherever I was last time I was wherever I was at.... I think...
