[2][19][20][21] He was also responsible for writing the preface and footnotes of the reedition of Ferdinand Denis [fr]' book Uma festa brasileira [pt], and translated part of it directly from Old Tupi.

The transcription and annotated full translation of the Camarão Indians' letters were published in the periodical Boletim do Museu Paraense Emílio Goeldi in October 2022.

[4][23][24][25][26] Since the year 2000, Eduardo Navarro has been training teachers of Old Tupi for indigenous schools in Paraíba, in an initiative called Projeto Poti.

[27] The first course in Old Tupi, held in Baía da Traição,[4] lasted two years and trained 17 monitors to act as teachers in Potiguaras schools, aiming to multiply the knowledge about this language in order to recover it.

[30] Eduardo Navarro was responsible for the translation into Tupi of the entire script of the film [pt] about the German adventurer Hans Staden, who visited Brazil twice in the 16th century.