Bringing a capsule safely down and landing it in one piece is only part of the challenge of recovery. After landing the capsule has to be found back and retrieved. Depending on where the mission is flown and will land this can be done in several different ways. 

The easiest way of finding back an object is to attach audio or visual guides such as lights, buzzers, fluorescent dye (water landing) or a beeper. When the search area is larger than can be covered with audio or visual guides you can use the last known location. The last known location can be obtained during flight using triangulation or GPS. The radio signal can also be sent to the ground station after landing, however, you should ensure a communication link is possible. Often the capsule will land in a region where no direct line of sight is feasible.