GeoCoins are simple, geocaching-themed, virtual “coins.” They are designed to be easy to create, easy to collect and easy to share with your friends! At their most simple, GeoCoins will allow you to send and receive virtual GeoCoins encoded with short personal messages.
On the technical side of things, cryptographic proof-of-work provides a  real-time peer to peer network of transaction verification, a “public ledger” of synchronized numbers, and unique possibilities for math-based puzzles.

Website announcement:

"Our POW blockchain is now considered developer abandoned. Please remove it from all mining pools. We have reached out to the Yobit exchange to request they delist the original blockchain, but no response was ever provided. Please remove the YoBit market listing from all price discovery calculations.

GeoCoin is now an ERC20 Token on the Ubiq Network. We migrated a snapshot of all balances in January 2018, captured at block # 1568125. The ERC20 token is currently trading at Bittrex and Cryptopia exchanges."