The Dip is the deviation from horizontal of the well path. This value is in degrees and is between +90 and -90. +90 is completely vertical and pointing up. Zero is completely horizontal. -90 is completely vertical and pointing down. This is used in conjunction with Azimuth when importing collar information into a WellData module.

The Dip and Inclination are similar, but are used in different ways. The Dip measures the deviation from horizontal of the well path and the Inclination measures the deviation from vertical of log measurements in a directional survey.