Police say a St John Ambulance app was crucial in rescuing an injured mountain biker near Lane Poole Reserve in Dwellingup.
The rider, a man in his 50s, was winched to safety into the RAC rescue helicopter around 6.45pm on Monday.
He was then flown to Royal Perth Hospital with non life-threatening injuries.
The man had the St John Ambulance First Responder app installed on his phone which shared his exact GPS location with paramedics and DFES.
It also provided crucial first aid tips.
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