Answer:

A. Compass

Step-by-step explanation:

We all know compass is used for navigation so based on my theory it is possible to call it the tool on the night, Why? Well for example when Magellan arrived here in the Philippines and while their ship was sailing it is understandable that it takes days or even months to travel from continents to continents. So it is likely to used compass even at night for them not to lost their way through their journey. IT'S JUST MY OPINION AND I MAY BE WRONG. Thanks!