For a tadpole log, the Dip Column and Dip Direction Column are for the structure orientation that you want the tadpole log to plot (i.e. fault, fracture, vein, etc).
The Hole Inclination Column and Hole Azimuth Column are for the well track or borehole orientation. These are important if you're displaying true vertical depth in your view.
Updated: October 5, 2016