The technologies that helped encourage longer sea voyages and exploration are:
- Compass: This navigation tool allowed sailors to determine their direction relative to the Earth's magnetic poles, making it easier to navigate across open waters.
Gutenberg's printing press also contributed to the sharing of knowledge and maps about exploration but was not a direct technology for navigation or sea voyages itself.
The other options, lantern and periscope, did not directly contribute to the technology of sea exploration in the same significant way.
So, the correct response is:
- Compass