Hello All,
Here's an options, if you have a good Color Printer, just set it to "poster" and print out the map.
I did this and with the settings, my map is 30" high. Not sure about the Width, I only wanted the Left half and that's 20" wide.
Plenty of room for notes & Post-its (if needed).
Of course, if you put all the pages together and laminate it, then you could use Dry Markers (but be careful not to wipe off your markings).