BT2 user manual - H-5911-9004-02-B Page | 32
The report displays hole information, tabular representation of all readings, a 2D side view and a plan view of the
hole.
From the Menu tab, tap Exports to export the surveyed and planned data in a choice of formats. Select the data
format and then pick the specific datasets you wish to export.
5.10 Points to remember
The following points summarise some important points to remember to ensure the optimal accuracy and
consistency from your Boretrak2 surveys. If you are having problems with your survey results, check that all these
points have been taken into consideration.
5.10.1 All deployments
• Check that you are running the most recent release of Carlson Boretrak, available from Carlson’s website.
• Make sure all data is downloaded after a survey. In the Project tab there must be no Deployments left
showing a yellow warning triangle.
• Handle the probe with care to ensure the gyro can keep track of the changing heading and to avoid
exceeding the rotation rate threshold of the IMU.
• The Process of collecting Boretrak readings during the deployment is entirely manual. This will mean you
will incur a gross error in the length of the hole (and thus in the end coordinates of the hole) if you:
o Forget to take a reading at a segment interval
o Take more than one reading at a segment interval
o Enter the wrong segment interval before the deployment
o Enter an incorrect Final Offset value.
5.10.2 Alignments
• The probe must be absolutely still when you carry out an alignment.
• The accuracy of the alignment heading determines the accuracy of the whole survey until the next
alignment. Position the alignment jig carefully and carry out the heading survey (or the alignment of the jig
between two known points) as precisely as possible. The required heading is that pointing towards the nose
of the probe.
• Carry out a new heading alignment as often as possible. For the very best accuracy, realign before each
hole. A reasonable target would be to align every three or four holes, but this will depend on the length of
each deployment, the required accuracy for your project and the practical realties of positioning the
alignment jig on your site.
• In the example above, the probe was aligned between two holes of known coordinates. This will often be
the most convenient method of establishing the heading in a quarry environment, but there are other options
depending on your project site and the facilities available to you. See section 4.3.
5.10.3 Horizontal and uphole deployments
• If you are using a push rod system or Boretrak rods to deploy the probe, the probe should be detached from
the deployment device before aligning the heading on the alignment jig. This ensures that the probe can sit
cleanly in the jig and that the position of the jig is not disturbed.
• For uphole deployments, you must use centralisers to hold the probe parallel to the sides of the hole. You
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