How many voyages did Bartolomeu Dias take?

Gulliver goes on 4 voyages:

1. A voyage to Lilliput and Belfuscu

2. A voyage to Brobdingnag

3. A voyage to Laputa, Balnibarbi, Luggnagg, Glubbdubdrib, and Japan

4. A voyage to the country of the Houyhnhnms