37Map Elements
This allows for the devotion of more screen space to the map itself while
allowing for easy zoom bar access when necessary.
Plus and Minus Zoom Buttons
Like north arrows, the inclusion of plus and minus zoom buttons is probably
due more to cartographic norms and conventions than need. Unlike north
arrows, however, pluses and minuses often take up even more screen space.
I actually encourage people to avoid using plus and minus zoom interface
designs whenever the amount of space is limited for the map itself (which is
almost always the case on mobile devices). If you want to include plus and
minus symbols on your Web map, the best method is to incorporate them as
part of a zoom bar (as several examples do in Figure3.4).
Plus and ...