A Sextant is an item in Path of Exile (PoE) that is used to modify the properties of a map. It can be obtained by completing specific challenges in the Atlas of Worlds, or through trading with other players. Sextants can be used to modify the properties of a map, including the monster level, the number of modifiers, and the amount of experience gained. They can also be used to add special modifiers, such as additional item drops, increased monster damage and increased experience. Sextants can be combined with other Sextants and Resonators to create powerful effects, such as additional item drops, increased monster damage and increased experience. Additionally, Sextants can be used to Awaken the Atlas, which allows the player to access higher-level content and rewards.