Whenever I had the chance to print a map on A3-sized sheets (11.69 x 16.53 inches) I usually just needed two sheets of that size for my whole planned trip, and most of the time it was fine enough to keep them apart and to swap them according to where I am and where I am heading to.
By printing on smaller A4 size sheets though (that's half the above size) any single sheet is rarely enough to hold sufficient information to be useful. Four sheets are necessary to represent the same area printable on two A3-sized ones and keeping to swap between each other and holding them next each other when I need to really feels clumsy and impractical.
So. I'd really love to join those sheets togeter to get a decent map out of them.
What is the proper way to print such a map, as the first step? I guess I should leave some margins so to be able to overlap the sheets.
And, how to actually join those sheets in the best possible way, so that the result is strong and stable and - ideally - gives the feel of a single map rather than a crappy bunch of sheets held somewhat together?