From Guild Wars 2 Wiki
Ogden's Notes are used in the creation of Celestial Cartographer's Gear for the Astralaria IV: The Cosmos collection.“
— In-game description
- Speak with Ogden in the Durmand Priory in Lornar's Pass to get his notes when you have unlocked the Astralaria IV: The Cosmos collection.
- If you destroy this item, you can receive another one by speaking to Ogden again.