Cypres and Vigil are the most commonly used brands of AAD .
As mentioned below , most ( if not all ) skydivers have an Automatic Activation Device which will open the reserve parachute if you pass below a preset altitude above a certain speed .
Cypres and Vigil are the most commonly used brands of Automatic Activation Device .
As mentioned below , most ( if not all ) skydivers have an Automatic Activation Device which will open the reserve parachute if you pass below a preset altitude above a certain speed .