When is a map not a map ?

A general rule of thumb about maps that I've always tried to adhere to is that a map should always have a North Arrow and a Scale Bar. The ESRI Mapping Center blog has a good point to make about small scale maps (continent-sized or so +/-) being unable to accurately show north in a single direction. The graticule is a better way to depict these types of maps.

Read The Article from ESRI.com