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Navigation is a tier three technology that unlocks the final upgrade for boats, the Battleship. It costs 15 stars to upgrade a Ship to a Battleship (20 stars in total to upgrade a Boat to a Battleship). The tech also allows all naval units to travel on ocean tiles and unlocks the Explorer task.

Navigation can only be researched after Sailing is researched.

Polar Warfare

Polaris has the technology Polar Warfare instead of Navigation. Polar Warfare unlocks the Battle Sled and the powerful Ice Fortress (instead of unlocking movement and the Battleship).

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