Calls have been made to create and maintain a public register containing the locations of defibrillators across Inishowen.
The life-saving devices are available in many towns and villages in Inishowen, and are often stored in premises such as sports clubs, community centres, shops, schools and businesses.
And the concern is that not all members of the public will know where their nearest defibrillator is should a cardiac emergency arise.
The Buncrana branch of the Irish Red Cross is launching a defibrillator location and awareness programme for the Buncrana area at the Sliabh Sneacht Centre tonight (Wednesday).
The programme aims to let people know where their nearest defibrillator is, and it is hoped to eventually extend the programme across all of Inishowen.
Brendan Duffy, who survived a heart attack some ten weeks ago, will attend the launch and tell his story.
A keen cyclist, Mr Duffy took ill at the Sliabh Sneacht Centre just minutes ahead of a bike race in April.
One club member rushed to his aid to immediately start performing CPR, while another member knew that there was a defibrillator at the nearby Inishowen Engineering premises.