Europe: I use an iPad Mini 5 (as mentioned before, cellular model is required for standalone GPS receiving) and wear it in a kneeboard - Skydemon is definitely the quickest and most intuitive VFR application, however I know that AirNavigationPro is another option although it isn't the most "polished" application. RunwayHD is also popular but I haven't used it much so cannot comment specifically on it.
Just looking at Skydemon's charts page; it covers the following African areas: Bostwana, DR Congo, Kenya, Malawi, Mozambique, Morocco, Namibia, South Africa, Tanzania, Zambia, Zimbabwe. If that suits you, I'd say go for it.