GNSS accuracy may change over time, especially for systems without IsoPoint signal correction. From one day to the next or even within a single event period, there can be considerable coordinate variations.
To overcome the deviations inherent in the GNSS positioning, the IsoView display disposes of position adjustment tools.
Line Displacement
The Line Displacement is used to adjust the position of the GNSS coordinates to a point on the nearest guide line currently configured in the navigation. An example of this feature use is when the user verifies that, even after aligning the tractor wheels with previously realized physical tire track on the ground, the deviation shown on the navigation screen is different from zero. In this situation, the Line Displacement corrects the difference and positions the navigation map on the wanted track.
Pressing the position adjustment button 
on the navigation screen, the Position Adjustment Vertical menu will be displayed, in which the user must select the Line Displacement option and press the confirm button 
, as shown in the image below.
After pressing the confirm button, the GNSS coordinates will be moved perpendicular to the target guide line, shown in red on the screen. The navigation screen will show the Alert Board with message Shift lines: OK, as shown in the following image.
Free Displacement
GNNS position can be changed in any direction, including in the direction of the guides themselves. A common situation in the field is when the application is carried out first in the field perimeter, also called the boundary application. Variations in the GNSS coordinates can lead to the condition that, when getting close to an applied area on the perimeter, it is noticed that there is a lack of application or an overlap of the implement boom in relation to the trail already made. In this type of situation, the Free Displacement tool can be used.
By pressing the position adjustment button on the navigation screen, the Position Adjustment Vertical Menu will be displayed, in which the user must select the Free Moving option and press the confirm button , as shown in the image below.
After pressing the confirm button, the navigation screen will be displayed in 2D view. The two side button bars will assume the configuration shown in the image below, and an Alert Board will be displayed with the message Displacement: 0.00 m | 0.00 m.
With each press of one of the four scroll buttons, the navigation map will be moved 5 cm in the indicated button design direction, as shown in the following table. At the Alert Board, the accumulated value will be shown together with arrows indicating the total displacement in both directions.
| Button | Occupation | Alert Board Text |
|---|---|---|
 |
Map shifting of 5 cm to the right | Displacement: → 0.05 m | 0.00 m |
 |
Map shifting of 5 cm to the left | Displacement: ← 0.05 m | 0.00 m |
 |
Map shifting of 5 cm up | Displacement: 0.00 m | ↑ 0.05 m |
 |
Map shifting of 5 cm down | Displacement: 0.00 m | ↓ 0.05 m |
After setting the displacements using the four buttons to position the navigation map correctly aligned with the implement boom, when pressing the confirm button 
the displacement will be saved and will be used in navigation from this moment on. The message Free movement: OK will be displayed on an Alert Board, as shown the image below.
