MotionX cannot be used with the T4A maps on iPad or iPhone.

MotionX also does not support Garmin compatible maps, in fact it only supports online maps like you would view from a website.  It has the ability to cache web tiles but that does not give you navigation.  MotionX as far as I know only allows you to view a map background and record tracks etc.

For iPad, we have two apps that can be used. 

For Navigation (route calculations and driving instructions):  Tracks4Africa Overland Navigator.  It is a once-off purchase of the entire Africa and allows for offline routing, meaning you do not need an internet connection.

For travel information:  Tracks4Africa Guide App.  This app combines cartography with guide book information in a single app.  The app itself is free with in-app purchases for countries you like to take along with you.  Once again this app works offline once the guides are installed.  The app does not give you navigation, but will show your location on the map as you drive and you can switch on categories of places to see what is near you.  For example if you are looking for camp site you switch on Camping and see the dots for camps around you.  You can further click on a dot and get detailed information on this place.