A Locator map is an item which can be used as a visual aid when exploring the Overworld or The End. It allows a player to capture surface features of areas they visit, plotting them on a hand-held map. It also allows players to locate other players, as the name states.

What does a locator map show?

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.

Do locator maps show other people?

Locator maps have the ability to show the location of other players with markers, but when you place these maps in item frames, they lose this ability.