I rarely need a chart unless I forget a particular item. I plan fairly extensively as a means of memorising the detail that is pertinent to my task with useful things like frequencies times etc. jotted on my knee pad. The map with lots of nice lines carefully plotted is usually folded so that the whole of the track can be viewed without re folding and in such a way that I can use only one hand to review. About A4 size suits me. If necessary I use more than one map of the same type to achieve this on longer trudges. I keep my map [s] handy in case needed.
Best Wishes