Locator map

A locator map, sometimes referred to simply as a locator, is typically a simple map used in cartography to show the location of a particular geographic area within its larger and presumably more familiar context. Depending on the needs of the cartographer, this type of map can be used on its own or as an inset or addition to a larger map.

[Source: Wikipedia - Locator map](http://en.wikipedia.org/wiki/Locator_map)