Treasures is a free, open-source geocaching app built on the Nostr protocol.
Hide and discover geocaches around the world without centralized servers
or subscriptions.

Features:

Create and discover geocaches worldwide
GPS-powered compass navigation to cache locations
Log finds with photos and verification
Multiple themes including adventure/pirate mode
Offline support for fieldwork
Lightning zaps for geocache creators
Fully decentralized — your data lives on Nostr relays