How do you use a locator map?

Locator maps show where all players are on a map (indicated by colored arrow-like shapes) that point in the player's facing direction. If someone is on the edge of a map, that means they are not in the area of the map.

Player 1 is always indicated by a white shape, as seen below.

When placed in an item frame, a lime shape will be added corresponding to the item frame's position. This marker will only be shown on its own map and will always point north (upwards).

Placing a banner down and right-clicking it with the map will add a banner marker with it's correct color.