Spectra Precision FAST Survey Reference Manual - Manual (Page 32)

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Note:
The Projection selection applies primarily to GPS work and your localization file. It enables automatic
calculation of grid to ground and ground to grid factors, for example (See Localization). However, the Projection can
also apply to total station work. When you do any processing of your data within the Raw Data option (File Menu),
there is an option "Reduce to Grid Coordinates". If this option is turned on, then the position on the projection is
calculated for each point in the traverse and for each sideshot, and leads to a specific grid factor. The grid factor,
combined with the elevation factor, leads to computation of the combined factor, which is applied to each traverse and
sideshot. The program then calculates the fieldwork at sea level on the projection (ground to grid). This can improve
your closures especially when traversing from one known grid system monument to another. Selecting and applying the
correct projection is also useful when trying to match total station measurements (often located on the ground) to
GPS-based survey work (typically located on the grid, at sea level).
Job Settings (Format)
This tab allows you to select the viewing format of the data displayed and entered in the current job.
 Coordinate Display Order:
This option allows you to display coordinates with the order of North then East or
East then North.
 Angle Entry and Display
: Options are Bearing or Azimuth. This applies to numerous commands, such as
prompting and displays in Sideshot Traverse (the backsight as azimuth or bearing), Intersections, and Inverse.
 Vertical Observation Display
: Allows you to set the default prompting to Zenith (0 degrees up, 90 degrees level),
Vertical Angle (90 degrees up, 0 degrees level) or Elevation Difference (up is positive in absolute units, down is
negative). Normally combine Elevation Difference with Horizontal Distance. If combined with Slope Distance, the
non-zero Elevation Difference will be used to compute the equivalent zenith angle and will reduce the Slope
Distance to a lesser Horizontal Distance. (Applies to entries in Manual Total Station mode).