Spectra Precision Survey Pro v3.80 Recon iPAQ User Manual - Manual (Page 136)

User’s Manual
128
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 6XUYH\ , 'LVWDQFH 2IIVHW or use
the , 2IIVHW 6KRW ± 'LVWDQFH Quick Pick. 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).
4. Enter a positive offset distance in the Horz Dist Offset
1_ft back
3_ft right