Context: Navigation is based on a variety of senses. Many birds have been shown to use a sun compass. Using the sun for direction involves the need for making compensation based on the time. Navigation has also been shown to be based on a combination of other abilities including the ability to detect magnetic fields (magnetoception), use visual landmarks as well as olfactory cues.

Question: What is navigation based on?
Answer: a variety of senses

Question: What do many birds use as a compass?
Answer: sun

Question: What does using the sun for direction involve?
Answer: the need for making compensation based on the time

Question: What else is navigation based on?
Answer: use visual landmarks

Question: What is magnetoception?
Answer: the ability to detect magnetic fields