Why is it called a compass, not a compass?

Why not call the compass a compass? In fact, the arrow on the compass generally refers to the arrow in the north, so why not call it a compass? China, located in the northern hemisphere, is a country with advanced astronomy. Long, long ago, ancient people were keen to observe the stars, planets and constellations in the sky. They are very familiar with the Big Dipper in the sky. Four of the seven stars make up a barrel, and the other three make up the barrel handle. Besides, the Big Dipper is also easy to find. Are located in the arctic region, very dazzling. Because of this, the "ancestor" of the Beidou compass is also called "Sina", which is in the shape of the Big Dipper. In fact, it is precisely because this tool is called "Sina needle" that everyone later came up with the saying of compass. In fact, no one cares why it's not called a compass, because the north and the south are opposite. If you know the north, you know the south, and if the south knows the north, you know the place, so people in the south know what this south is. Why didn't the ancients call it "North Star" or "Compass"? In ancient China, "south" has always been the main direction of the north and south, and facing south is the respect. There is a saying that "the south dynasty is king and the north dynasty is north". So the direction is mainly south. In fact, saying so much is actually due to historical culture and cultural customs. It is a traditional name in China, of course, it can also be called compass, and it is also called Beidou in foreign countries and military fields. In fact, Beidou means Beidou, which means the stars in the sky.