The Octo-Compass is a small device used by Captain Barnacles. Aside from functioning as a regular compass, the Octo-Compass also features functions typically found on a device such as an Octo-Tablet and Octo-Watches in Above & Beyond. The device also features a camera lens on it's back, and almost never leaves the Captain's side.
So far, the only times the Octo-Compass is seen separated from Captain Barnacles are in The Crafty Cuttlefish, The Manatees, The Amazon Adventure and The Caves of Sac Actun.
The only other characters seen touching the Octo-Compass are the Vegimals in The Crafty Cuttlefish and The Caves of Sac Actun, Tweak in The Crafty Cuttlefish, and Berta in The Amazon Adventure. While the only other characters seen using it are the Cuttlefish in The Crafty Cuttlefish, Orson and Ursa in The Walrus Pups, and Tweak in The Caves of Sac Actun,