How does the Feng Shui compass point?

What is the direction of the geomantic compass? -and, in the use of the compass, that is, according to the meaning of that side. The top of the turtle mountain is ugly at the same time, that is, sitting in the direction of the top of the turtle mountain, leaning to the side of the compass where the ugly mountain does not face. The specific thing on the compass should be that Guiding Mountain distributes gold to Gengzi and Gengwu, and the regular three-in-one east-west gauge distance is within the range of 16: 5 to 19: 5.