The Voynich Manuscript as an Iberian-African Voyage Record

[ReneZ]

If the voynich mauscript is from Portugal, Spain or  Italy, I don't know, but what we can say for sure, there is at least a part, that has something to do with nautical navigation.

I understand that you feel confident about that, but there are lots of other manuscripts that deal not with navigation, but with astrology and/or cosmology, that have similar illustrations to the ones you show, and (to some extent) to the ones in the Voynich MS.
If you search the forum for (Barbara) Obrist, you will find some good examples.