The woman, who has not been named, was sailing her yacht single-handed when she went overboard at around 2.30am on Friday, June 17.
Stranded alone in the freezing waters, she watched in horror as her yacht sailed away on autopilot.
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Luckily, she was equipped with a lifejacket and a Personal Locator Beacon (PLB), which she was able to activate to alert rescue teams to her location.
HM Coastguard immediately put out a MAYDAY broadcast to all vessels in the area and a rig supply ship made its way to where she was found floating alone in the darkness.
The crew spotted her flashing a distress light from two nautical miles away and were able to rescue her within an hour of her going overboard.
She was then passed into the care of Fleetwood’s RNLI team and was taken ashore by lifeboat to be checked over by North West Ambulance Service.
The search and rescue helicopter from Caernarfon in North Wales was also sent to help with the search and managed to locate her yacht as it continued to sail towards the Lancashire coast.
It was intercepted by the other local vessels and towed back to shore by Lytham lifeboat crew.
A spokesman for Preston Marina said: “Last week, one of our boat-owners who was sailing back from the Isle Of Man alone in good weather at night, fell overboard while the boat sailed on, on autopilot.
“She was in the water for over an hour.
“Her life was saved because she was wearing a good life jacket - and had a Personal Locator Beacon (PLB).
“The PLB sent an electronic distress signal to the Coastguard, with her exact position. Otherwise she had no way of raising an alert and calling for help.
"She is very shaken, a bit bruised, but she is OK thankfully.”