It can tell you which way is north
Polaris, the North Star.
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Navigators can use a magnetic compass to determine which way is North even when they can't see the North Star.
Polaris is the North Star. It is said to never move and always point North. Sailors would look for Polaris in the olden days when they needed help finding there way.
with the help of star
the star, like the guiding north star is for sailors and stuff, also i think a horse?
A. the earth is round
Navigators measured the angle of Polaris (North Star) at their home port. To return they sailed until the star was at the angle of home port - then turn left or right and "sail down the latitude," keeping the angle the same all the way.
A compass tells sailors which direction they are going in (North, South, East, or West). This helps the sailors not to get lost and to keep on track to their destination.
Well, on MY planet, there is only one moon. Not sure about your planet. Here the sailors generally do not navigate by the moon- but they do use stars. In the north, sailors use the Pole Star, also called the North Star or Polaris. In the far south, you can't see Polaris, so sailors use other groups of stars, like the Southern Cross.