Azimuth Correction

You can enter an azimuth correction when you:

• Validate the drillhole data.
• Calculate downhole coordinates.
• Generate a trace coordinate file.
• Use one of the drillhole functions where the trace coordinates are calculated each time you run the function.

The correction occurs to the values output to the Interval or (trace) Coordinate files.

This is useful when the survey azimuths are recorded in terms of magnetic North with a known deviation from grid North.

For example, the survey azimuths may be recorded in terms of magnetic north with a known deviation from grid north. A suitable correction can be applied here. This entry requires a number in the range 0-360°.

Positive values are added to existing values, negative values are subtracted. Adjustments that result in either negative azimuths or values greater than 360 are recognised and used correctly by the program.

Apply to first azimuth

Selecting this option will cause the azimuth correction to be applied to the first azimuth and all subsequent azimuths.

Where drillhole collar surveys have an azimuth taken in terms of grid north and subsequent downhole azimuths are taken in terms of magnetic bearings, do not apply the azimuth correction to the first azimuth.