Spectra Precision Survey Pro v4.6 Ranger User Manual - Manual (Page 81)

Conventional Fieldwork
71
Surveying with True Azimuths
Some people need to collect all of their horizontal angles in the form
of azimuths. Survey Pro can help automate this process by computing
the backsight azimuth after each new setup in a traverse and
updating the backsight circle and total station’s horizontal angle
accordingly.
1. You can setup on any existing point and use any other point in
the job as a backsight if the coordinate system is properly aligned
with true north. If not, you can occupy any point as long you have
a known azimuth to any reference.
2. In the Surveying Settings screen ( Job > Settings > Surveying ),
confirm that the Survey with True Azimuths checkbox is checked.
3. Setup the total station over the occupy point and aim it toward
your backsight.
4. Access the Backsight Setup screen; enter the Occupy Point, and
toggle the . BS Direction . / . BS Point . button to BS Direction . .
Note: When backsighting on a point, selecting BS Direction can still
be used, as described next, making it easier to view the azimuth to
the backsight.
5. If backsighting a known azimuth, enter it in the BS Direction
field. If backsighting a point, use the shortcut method to enter
the azimuth from the occupy point to the backsight point in the
BS Direction
field. For example, if you are occupying Point 1 and
backsighting Point 2, enter 1-2 in the BS Direction field. Once the
cursor leaves that field, the computed azimuth will replace what
you typed.
6. Tap the Circle… button, enter the backsight azimuth in the
Backsight Circle
field and tap Send to Instrument (or Set when
running in Manual Mode). This will set the backsight circle as
the horizontal angle in the total station and set the same angle as
the Backsight Circle value. This angle will then be subtracted
from all horizontal angles sent from the total station.