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A Rescue Co-ordination Centre New Zealand spokeswoman said it received a distress beacon alert at 7am from the Dusky Track in Fiordland National Park.
A female tramper had injured an ankle about 4pm the day before. She and her male tramping partner set up camp for the night and activated the beacon at first light yesterday morning.
A helicopter from Southern Lakes Helicopters was sent.
"The trampers were hard to see because the forest canopy was very thick but the helicopter managed to locate them and winch them both to safety," the spokeswoman said.
The woman was taken to the Te Anau Medical Centre.
"Distress beacons save lives. Carry at least two types of reliable emergency communications that will work even if they get wet," the spokeswoman said.
"You can’t always rely on a mobile phone because it might be out of range, run out of battery or be damaged by water."