Sao Tome and Principeexports of Radio navigational aid apparatus was $2.24K . Sao Tome and Principeexported Radio navigational aid apparatus to Portugal ($2.24K )Sao Tome and Principeexports of Radio navigational aid apparatus was $2.24K . Sao Tome and Principeexported Radio navigational aid apparatus to Portugal ($2.24K ).Radio navigational aid apparatus imports by country in 2022