You need an approval from the Direction of Civil Aviation (NCAA department).
You can find all info here: NCAA - Aerodromes
Captain Michael Schubert (Tel +264 61 702 239) is very helpful!
The current rules around flying your drone in Namibia are quite strict. The country is very familiar with drones and is trying to regulate it more to protect the animals in some of the reserves, as many operators in the past have buzzed the animals with their drone and so on causing a disturbance.
You can get a permit from the Namibia authorities directly which takes several weeks, or we can obtain a permit on your behalf here, Namibia Drone Laws & Permits
Please PM or reply here if you have any specific questions and we would be more than happy to help!