Navigational Instruments & Mythical creatures

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Across
  1. 3. It was the most popular type of ship used in the Mediterranean and it was heavy and slow.
  2. 4. Serpent A mythical monster that was said could sank ships and devoured sailors.
  3. 6. Ancient instrument used by mariners to tell time, find altitude and latitude.
  4. 7. This instrument was an improved version of astrolabe, and it made it easier for mariners to know if they are going in the right direction.
Down
  1. 1. Monster A mythical sea creature that could fly.
  2. 2. It was invented by the Portuguese, and it took men to distant lands.
  3. 5. Helped the mariners or explorers to plot down their discoveries.