Morning Francois,
I am sure other people will comment also. As per the Tracks4Africa website (
Tracks4Africa - Ways to submit data.),
you require a GPS to record your track logs and mark the places you have visited. Refer to this section:
If you use a GPS to record the roads you have travelled and mark the places you have visited, then you can send us these by downloading your data to a computer and saving the files in a known GPS format. We prefer GPX or GDB. Thereafter, you can submit your
GPS data online or via email.
Once your data is processed and included in a new version of our maps, you will be asked to download this Garmin compatible map and check that your data has been processed to your liking.
I do note that the link for the "standards for field data collection" looks like it is supposed to open/download a PDF that does not happen on my side, it just remains on the same page.
I do not have a lot of experience with the Guide App yet, however from the website it looks like you are able to send corrections and checkins via the app.