Construction offsets
To stake positions offset from the road, leaving the roadway clear for construction, define one or more construction offsets for the road. The construction offset is applied to all positions in the road.
In the plan or cross section view, a construction offset is indicated by a green line, and a double circle indicates the selected position adjusted for the construction offsets.
When you define a construction offset for a road, the offset is:
- used for all roads of the same file format in the same job.
- used for all subsequent surveys of the road in the same job, until a different construction offset is defined.
- not used for the same road when it accessed from a different job.
To define a construction offset, tap and hold in the plan view or cross section view and select Define construction offsets.
If you are surveying a Trimble road using the traditional menu selection, you can define construction offsets in the Stakeout screen.
Horizontal construction offsets
When measuring positions relative to or staking stations on the horizontal alignment/master string, you can define a horizontal construction offset where:
- A negative value offsets points to the left of the horizontal alignment/master string.
- A positive value offsets points to the right of the horizontal alignment/master string.
For all other strings, including side slope strings, you can define a horizontal construction offset where:
- A negative value offsets points toward the horizontal alignment/master string (in).
- A positive value offsets points away from the horizontal alignment/master string (out).
Construction offsets are not automatically applied to a side slope offset. When you stake a side slope, select the Store both catch and construction offset check box to measure and store the catch position. See Catch point.
Trimble or LandXML roads
For a Trimble road, tap 
next to the Horizontal offset field to specify if the offset is to be applied:
- Horizontally
- At the slope of the line from the previous string to the current string in the cross section
- At the slope of the line from the current string to the next string in the cross section
The following diagram shows a Horizontal offset (1), Slope previous offset (2) and Slope next offset (3) applied to a position. For the Slope previous option, the slope of the offset is defined by the slope of the line (4) before the position (5) selected to stake. For the Slope next option, the slope of the offset is defined by the slope of the line (4) after the position (6) selected to stake. The Vertical offset value in the diagram is 0.000.
For points with zero offset, you cannot apply horizontal construction offsets at the slope value of the previous line.
When measuring positions relative to a string (except by the Measure nearest string option) or staking stations on a string, you can define a horizontal construction offset by your current position. To do this:
- Tap next to the Horizontal offset field and select Calculated.
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Navigate to the position you want to place the stake.
The Go left / Go right navigation delta is replaced by the distance to the horizontal alignment when the horizontal offset is Calculated.
-
Measure and store the point.
The calculated horizontal offset is reported in the As staked deltas.
GENIO roads
For a GENIO road, tap next to the Horizontal offset field to specify if the offset is to be applied:
- Perpendicular to the master string for the sub string being staked
- Perpendicular to the sub string being staked
The following diagram shows a Horizontal offset (1) applied perpendicular to the master string (2) and a Horizontal offset (3) applied perpendicular to the sub string (4).
When staking stations on a string, you can define a horizontal offset by the distance from the selected position to the master string. To do this:
- Tap next to the Horizontal offset field and select At string.
- Navigate to the target which will be at the master string.
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Measure and store the point.
The calculated horizontal offset is reported in the As staked deltas.
This option is not available if the string being staked is a 5D string or if the horizontal offset is applied perpendicular to the sub string.
When measuring positions relative to a string or a station on a string, you can define a horizontal offset by the distance from the selected position to your current position. To do this:
- Tap next to the Horizontal offset field and select Calculated.
-
Navigate to the position where you want to place the stake.
The Go left / Go right navigation delta is replaced by the calculated horizontal construction offset.
-
Measure and store the point.
The calculated horizontal offset is reported in the As staked deltas.
This option is not available if the horizontal offset is applied perpendicular to the sub string.
Vertical construction offsets
You can define a vertical construction offset where:
- A negative value offsets points vertically down.
- A positive value offsets points vertically up.
The Vertical Offset value is not applied to a DTM surface.
Tap next to the Vertical offset field to specify if the offset is to be applied:
- Vertically
- Perpendicular to the element in the cross section before the point being staked
The following diagram shows a Vertical offset applied vertically (1) and a Vertical offset applied perpendicular (2) to the previous cross section element (3).
Station construction offsets
For roads derived from a GENIO file you can apply a station construction offset where:
- A positive value offsets the point in the direction of increasing station (Forward).
- A negative value offsets the point in the direction of decreasing station (Backward).
- You cannot apply a station construction offset to a 5D string that represents the catch position.
- The station construction offset respects the geometry of the string being staked.
