The accuracy of the signal GPS (GNSS) may vary over time, particularly for systems without IsoPoint signal correction (see Technical Data / Signal Correction). From one day to the next, or even within the span of a single event, there can be considerable variations in coordinates..
To circumvent the deviations inherent in the positioning of GNSS, the monitor IsoView has Position Adjustment tools.
Line Offset
The Line Offset tool is used to adjust the position of the coordinates of GNSS to a point on the line closest to the guidance currently set in the navigation. An example of the need for this functionality is when the user verifies that, even after aligning the tractor wheels with a physical track of the tires on the ground previously performed, he realizes that the deviation from the guide shown on the navigation screen is different from zero. In this situation, the Line Offset corrects the difference and positions the navigation map again on the trail you want to follow.
Pressing the adjust position button 
on the navigation screen, the vertical menu of Position Adjustment, in which the user must select the Line Offset option and press the confirm button 
, as per the image below.
After pressing the confirm button, the coordinates of GNSS will be offset perpendicular to the target guide line, shown in red on the screen. The navigation screen will show the Alert Board with the message Row Offset: OK, as shown in the following figure.
Free Displacement
the position of GNSS can change in any direction, including in the direction of the tabs themselves. A common situation in the field is when the application is carried out first on the perimeter of the plot, also called border. The variations of the coordinates of GNSS can lead to the condition in which, when approaching the applied area on the perimeter, it is noticed that there is a failure or an overlap of the implement bar in relation to the trail already made. In this type of situation, the user can use the Free Displacement tool.
By pressing the adjust position button on the navigation screen, the vertical menu of Position Adjustment, in which the user must select the Free Displacement option and press the confirm button , as per 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 figure below, and the Alert Board will be displayed with the message Displacement: 0.00 m | 0.00 m.
Each time one of the four displacement buttons is pressed, the navigation map will be displaced by 5 cm in the direction indicated by the drawing on the corresponding button, as shown in the following table. At the Alert Board, the accumulated value up to the moment will be shown, and arrows indicating the direction of the total displacement in both directions.
| Button | Occupation | Alert Board Text |
|---|---|---|
 |
Moves the map 5 cm to the right | Deslocamento: → 0.05 m | 0.00 m |
 |
Moves the map 5 cm to the left | Deslocamento: ← 0.05 m | 0.00 m |
 |
Moves the map 5 cm up | Deslocamento: 0.00 m | ↑ 0.05 m |
 |
Moves the map down 5 cm | Deslocamento: 0.00 m | ↓ 0.05 m |
After carrying out the displacements using the four buttons to position the navigation map correctly aligned with the implement bar, when pressing the confirm button 
the displacement will be saved and will be used in navigation from that moment on. The message Free scroll: OK will be presented in Alert Board, according to the figure below.
