What function does the RSL serve?

The function of the RSL, or Automatic Activation Device, is to create a connection between the main riser and the reserve ripcord. This is a crucial safety feature in skydiving. In the event that a parachutist experiences a malfunction with their main parachute and does not have time to deploy their reserve manually, the RSL can automatically initiate the deployment of the reserve parachute. When the skydiver activates the reserve deployment by either releasing the main parachute or a certain amount of freefall time has elapsed, the RSL ensures the reserve parachute is deployed, significantly increasing the chances of a safe landing.

The other options listed do not accurately describe the RSL's function. For instance, RSLs do not assist in packing parachutes or connect to simulators. They also do not measure altitude; instead, other devices, such as altimeters, serve that purpose. Understanding the correct role of an RSL is essential for maintaining safety in skydiving practices.