In some situations the entire legend could conceivably be omitted. For example,
map layouts on slides aren’t always necessary due to the fact that the presenter will
be talking about the slides and can point out the necessary features. Legends are also
often unreadable on slides presented to a large audience. Be cautioned, though, that
many slides are reproduced online or in other media, and these will need legends,
especially when they are not accompanied by the presenter’s notes. Another situation
in which you could omit a legend is when you are creating report maps that comprise
a series of similar features. In this case, one legend at the beginning of the series can
apply to all the maps and thus allow more space for the map elements on the subse‑
quent pages. Simple, small report maps may also have so few features that they only
need to be explained in the text of the report or in the map captions.