Did You Know? GCS900 Vertical Offset

The GCS900 provides two methods for vertically offsetting a surface

  1. Perpendicular Lift: Machine guidance is shifted perpendicularly to the design surface. This means that the thickness of the lift will be the same on slopes as on level surfaces.

  2. Vertical Lift: Machine guidance is shifted vertically. This means that the thickness of the lift on slopes will be less than on level surfaces.

Perpendicular lifts are useful in landfill applications when installing clay and protective cover layers. This ensures that specified thicknesses are achieved on slopes. Without the perpendicular offset function, a slope factor must be calculated for each % slope in the design. The operator must then remember to use different offsets for each slope and level area. Using different offests can be confusing, and could ultimately lead to errors, reworks, or wasted materials.

Meanwhile, vertical lifts are good for all other work when lift thickness is not critical.

The default vertical offset type is vertical lift. Perpendicular lift is only available through Manager Mode. To access Manager Mode:

  1. Press and hold OK and POWER for initial power up on CB430/460 until the Trimble screen appears.

  2. You will know screen is in Manager Mode if some of the MENU items have red dots next to them. The red dot indicates that the item is only available in Manager Mode.

Once in Manager Mode, use the following steps access the vertical offset functions:

  1. Press F4 softkey to access the vertical offset menu

  2. Press F1 softkey

  3. Press F4 to select “Perp. Lift” or F5 to select “Vertical Lift”

  4. For a perpendicular lift, enter desired offset in the lower “B” cell

  5. Perpendicular offset amount will be displayed on the softkey

  6. Vertical offset amounts are displayed in the text ribbon at the bottom of the screen

Remember it is typically best to use only one offset type at a time. Using both vertical and perpendicular lifts at the same time is often confusing.

For visual instructions, download the PDF version of this blog post below.