Spectra Precision Survey Pro v4.6 Recon and Nomad User Manual - Manual (Page 158)

User’s Manual – Conventional Mode
148
Offset Shots
Three individual screens are used to perform offset shots. These
include the Distance Offset screen, Horizontal Angle Offset screen,
and Vertical Angle Offset screen.
Offset shots are generally performed to compute coordinates for
points that cannot easily be occupied by the rod. The offset routine
that you choose will depend on your situation. Each routine is
explained below.
Distance Offset Screen
The Distance Offset screen will result in the storage of a point
that is located at a specified horizontal and/or vertical distance
away from the current rod location.
The routine requires independent horizontal and vertical
distances (offsets) that are applied to a shot from the rod
location.
In the example below, a point is stored that is 3 feet to the
right of the prism and 1 foot behind the prism from the point of
view of the total station.
1. From the Main Menu, tap . Survey , Distance Offset .
If you have not already setup your backsight, you
will need to do so before the Distance Offset Shot
screen will open.
2. The rod person should measure the horizontal and /
or vertical distance to the new point from the rod
position. Horizontal measurements should be taken
parallel and / or perpendicular to the line between
the total station and the rod.
3. If the new point is to the left or right of the rod
location, enter the perpendicular offset distance in
the Offset field and select ~L if the new point is on
the left side, or ~R to if the new point in on the right
side (from the total station’s point of view).
1_ft back
3_ft right