Name 2 invention that helped with navigation and exploration?

There was no real technological help in 1490's. How they did explore is they would examine the stars, sun and landmasses to figure out which way they were heading. The first real piece of technology that made exploring at lot easier was the compass created in 221-230 BC by the Chinese but the first recording of someone using the compass to explore was in 1371 by a Chinese explorer named Zheng He.