The South Western Ambulance Trust says refresher training is being introduced after ambulances in Somerset, Dorset, Cornwall and Devon went to the wrong address more than 500 times in the past five years.
The figures were obtained by the BBC and the South Western Ambulance NHS Trust crews deal with nearly 500,000 calls each year.
Of the 94 incidents in 2013, 33 were due to incorrect details given by the person calling the ambulance, 28 were as a result of errors by the Trust's call handlers.
Neil le Chevalier, one of the trust's directors, told the BBC: "Taking a 999 call can be very distressing and it can sometimes be very difficult to get the address for our call handlers.
"We're introducing refresher training. We are using some of the occasions where possibly an address has been inaccurate as a learning basis for our staff."
