Operating Instructions
32
DigiTrak
®
F5
®
SST
®
Operator’s Manual
20. Compensate
for Differences Between Tool’s Logged
Position Data and Tracked Position
Differences between the computer’s calculated position and the tool’s tracked position can occur if the
first point was not logged when the SST transmitter was ½ in and ½ out of the ground, such as when
using a mud motor, or in cases where the heading measured by the SST transmitter has natural
variations over the bore path, as determined during a pre-bore walkover. In such cases, it may be
necessary to compensate by changing the pitch reading, heading, or rod length.
To modify these values, place your mouse on the row of data to be edited in the data points table in the
main application window, and double-click to open the Edit Steering Tool Data Point dialog box (see
figure below). Note that, if you make a change to the data, the rod number for that row will show a gray
rod as opposed to black for an unmodified data point and it will be highlighted on the data chart.
Edit Steering Tool Data Point Dialog Box
Depth values that are calculated in the LWD software can only be edited by changing these input values.
To adjust the recorded bore path based on externally measured data, use the confidence points tab in the
data tables area of the main application window. Topography must be input in order to use confidence
points. See the
Inputting and Editing Drill Data
section for more information.
