As a safety measure, the SSN has decided that each pilot has to carry a working unit of Spot with him connected to the parachute harness. Tracking must be enabled.
Spot acts as a PLB, a personal locater beacon, in case of emergency or an outlanding. In contrast to a PLB, SPOT additionally offers the tracking function
It can be purchased here:
The flight office staff will help you with setting up the spot, but it is highly recommended you already do that before your arrival in Namibia. You may use this documents to configure your SPOT.