What is value of dip at …

Let us begin with the definition of magnetic dip.Magnetic dip or magnetic inclination at a place is defined as the angle which the direction of the total strength of the earth’s magnetic field makes with horizontal line in magnetic meridian . It is represented by the symbol δ Dip circle is the instrument used for measuring the value of magnetic dip.

At the magnetic north pole the needle will show 90 deg. (North points away from ground). At the magnetic south  pole dip angle is - 90 deg.  Needle's north points vertically down.  At the magnetic equator, you will have the needle pointing horizontally. There is no vertical component. So dip angle is 0 deg.
As you move from the magnetic equator towards the magnetic pole, the angle increases in the northern hemisphere. In decreases in the southern hemisphere.