Navigator

"Tails, do you actually trust that ridiculous little gadget that Robotnik built for you? He's not exactly trustworthy. He could've put a bomb for us in there!"

- Sonic not trusting the Navigator.

The Navigator is a device which helps locate the city of Robotropolis. It is gifted by Dr. Robotnik and given to Tails.

Welcome to Eggmanland
When Sonic and Tails are demanded to go to Robotropolis so they can save the Land of The Sky and Planet Freedom, Robotnik suggests them to use the navigator so they can use the fastest and shortest route to the destination.

Sonic VS. Metal Sonic!!
Sonic fights Metal and gets grabbed by the neck, being choked. Tails uses the navigator to corrupt his data, so Sonic can fight him. The president's ship then crashes into a bridge of ice. Tails and Sonic try to fly to him but get attacked by Metal. Tails tries to use the same tactic, but Robotnik breaks the gadget.

Appearance
The navigator is a purple device that you can wear around your wrist. On the outside, it looks like Robotnik's face, once opened, you'd see a small satellite and two keyboards, completed with a screen to locate objects, destinations and to hack electronics, for example: Metal Sonic.