Spectra Precision FAST Survey Reference Manual - Manual (Page 146)

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 Results:
Before storing, you can preview the data by selecting the RESULTS tab. If valid data has been entered in
the LASER or OFFSET tab, the result will appear as shown below. In this window, you can also change the GPS
antenna height, or specify a vertical difference for your target point. You can also specify the point ID and
description for the point that will be stored.
Offset by Intersection
Use Offset by Intersection to calculate a point based on two GPS positions and two distance offsets. The distance values
can either be manually entered or input with a laser. To use a laser, you must first activate it by selecting Settings. For
more information on laser setup, see the Peripherals section of this manual.
 Offset:
Under the OFFSET tab, press Read Point 1 to read the first point from GPS. Now enter the distance of the
point to be stored, or press Read Dist 1 to read this distance from a laser. Repeat this process for the second point.
Switch to the RESULTS tab to see your solution. If your distances and GPS can’t be triangulated, you may have to
return to this tab to adjust the values.
 Results:
After you have two GPS positions and two distances that form a valid triangle, click on the RESULTS tab
to view the resulting point. If valid data has been entered in the OFFSET tab, the result will appear as shown below.
In this window, you can adjust the GPS antenna height, or specify a vertical difference for your target point. You
can also specify the point ID and description for the point that will be stored. The intersection method generates two
solutions, so you will have to select which one you want by clicking the appropriate radio button.
Offset by Two Point
Use Offset by Two Point to calculate a point based on two GPS positions and a distance from the second point. If
Straight
is selected, the distance offset from the second point is along the 3-D vector created by the two GPS points. If
Left
or Right is selected, the offset is perpendicular to the 2-D vector created by the two GPS points, and the second
point’s elevation is used as the elevation of the resulting point. The distance offset can either be manually entered or
input with a laser. To use a laser, you must first activate it by selecting Settings. For more information on laser setup,
see the Peripherals section of this manual.