Sokkia SRX1, Operator'S Manual, Page: 109 / 184

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18.OFFSET MEASUREMENT
Offset measurements are performed in order to find a point where a target cannot be installed directly
or to find the distance and angle to a point which cannot be sighted.
• It is possible to find the distance and angle to a point you wish to measure (target point) by installing
the target at a location (offset point) a little distance from the target point and measuring the distance
and angle from the surveying point to the offset point.
• The target point can be found in the three ways explained below.
• The instrument station and backsight must be set before the coordinates of an offset point can be
found. Station and backsight setup can be performed in the Offset menu.

Station setup: "15.1 Entering Instrument Station Data", Backsight setup: "15.2 Azimuth Angle
Setting" .
• It is possible to allocate softkeys in the Offset menu to suit various applications and the ways that
different operators handle the instrument

"21.6 Allocating Key Functions"
Finding it by entering the horizontal distance from the target point to the offset point.
• When the offset point is positioned to the left or right of the target point, make sure the angle formed
by lines connecting the offset point to the target point and to the instrument station is almost 90°.
• When the offset point is positioned in front of or behind the target point, install the offset point on a
line linking the instrument station with the target point.
PROCEDURE
1. Set the offset point close to the target point and
measure the distance between them, then set up
a prism on the offset point.
18.1 Single-distance Offset Measurement