Spectra Precision Survey Pro v3.80 Recon iPAQ User Manual - Manual (Page 137)

Screen Examples
129
field if the offset to the new point is behind the rod location (from
the total station’s point of view), or enter a negative offset
distance if the new point is in front of the rod location.
5. If the new point is at a different elevation than the rod location,
enter the a positive vertical offset in the
Elevation Offset field, or a
negative vertical offset if the new point is below the rod location.
6. After all the appropriate fields are filled in correctly, aim the total
station at the prism and tap the
6KRRW button. The offset
distance(s) entered will be applied when computing the
coordinates for the new point and the new point will be stored as
a side shot.
Horizontal Angle Offset Screen
The Horizontal Angle Offset screen is used to store a new point that
lies on a line tangent to the rod and perpendicular to the line formed
between the total station and the rod. (See illustration.) The routine
requires two shots by the total station; one at the prism, located to
the side of the new point; and one in the direction of the new point.
This example explains how to store a point at the center of an
obstacle – such as a big tree.
1. From the Main Menu, tap  6XUYH\ , +RU] $QJOH 2IIVHW or use the
, 2IIVHW 6KRW ± + $QJOH Quick Pick. If you have not
already setup your backsight, you will need to do so
before the Horizontal Angle Offset Shot screen will
open.
2. The rod person should position the prism to the side of
the location of the new point so that the angle formed
by the new point, the prism, and total station form 90°.
(See illustration.)
3. With the total station aimed toward the new point, tap
the
$LP &HQWHU button. Only the horizontal angle is
measure during this shot so a prism does not need to
be used.
4. Aim the total station toward the prism located at the
side of the new point and tap
6KRRW 3ULVP . The new