Minecraft wiki entry for Map, associated text: To record the world on a map, that specific map must be held in the player's hands while the player moves around the world. The world is recorded as-is during exploration, meaning that if the world is modified, a player must revisit the area while holding the map to update the map's view. Maps can also be cloned. If a player holds a map whose clone is on display in an item frame, then that map updates while holding its clone.