Every morning for the past week, a battery-powered drone with a range of 300km has been launched from the MV Steve Irwin, which is attempting to disrupt the annual Japanese whale hunts in the waters off Antarctica.

Once the pursuit began, three Japanese harpoon/security ships moved in on the Steve Irwin to shield the Nisshin Maru to allow it to escape.

Subsequent attempts by Japanese whaling ships to block the anti-whaling flotilla and allow the whale factory ship Nisshin Maru to escape were foiled by the activists, who repeatedly launched the drone, which uses GPS co-ordinates and provides both video and still images to track the ships.

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