Rescuers say the light from an iPad guided them to a day tramper who went missing in Fiordland National Park.
The 66-year-old English tourist lost the track during a walk with his wife in the Lake Marion area, off Hollyford Rd, on Wednesday.
The couple had arrived at the Alpine Lake together at 1.45pm but parted ways about 3pm, when the husband began the descent back to the car park about 15 minutes before his wife.
When his wife could not find him she searched the track twice before raising the alarm at Gunns Camp about 7.30pm.
Police said the man had a pre-existing heart condition and a search and rescue response was launched immediately.