The Limit corresponds to the perimeter of the area of a field. The system GeoNave allows the user to draw a virtual line around the field, demarcating the useful area within which the application must be carried out.
The Limit function is recommended in conjunction with licenses that have section control – ISO 31, ISO 32, ISO 34, ISO 35-, since the functionality causes the sections to be closed automatically when outside the area marked by the boundary line.
In the menu Settings during Navigation, when the limit is not yet demarcated, the parameter will be present Limit Type, containing several options for creating the field boundary line.
With the exception of the type limit Project, the demarcation of the limit must be carried out by the user, traveling with the machine directly over the perimeter of the field. The main difference between these types of limits is the position in which the line is demarcated in relation to the center of the implement bar.
- Half Bar – The boundary line is demarcated exactly on the path taken by the center of the implement bar.
- External – Barra Inteira – The boundary line is demarcated at the outermost point of the implement bar, according to the direction (clockwise or counter-clockwise) performed in the field perimeter.
- Internal – Barra Inteira – The boundary line is demarcated at the innermost point of the implement bar, according to the direction (clockwise or counterclockwise) performed in the field perimeter.
- External – Custom – The limit line is demarcated at a distance determined by the parameter Limit Shift, that will be present in the navigation settings menu if the limit type is External – Custom, measured from the central point of the implement bar towards its external end, according to the direction (clockwise or counter-clockwise) performed in the field perimeter.
- Internal – Custom – The limit line is demarcated at a distance determined by the parameter Limit Shift, that will be present in the navigation settings menu if the limit type is Internal – Custom, measured from the center point of the implement bar towards its inner end, according to the direction (clockwise or counter-clockwise) performed in the field perimeter.
Start demarcating the boundary
On the navigation screen, for limit types Half Bar, External – Barra Inteira, Internal – Barra Inteira, External – Custom and Internal – Custom, the start limit button will be present 
. When pressing the button, a black dotted line is drawn on the navigation screen over the path taken by the machine. It will also show the Alert Board with the text Limit start: OK and the type of limit just below. The following figure illustrates the demarcation of the beginning of the limit, for the example of Meia Barra.
After demarcating the starting point of the limit, the button bar on the right side of the navigation screen will show two other buttons. The pause limit button 
and, if the machine has moved more than 20 meters from the start point, the end limit button 
.
Pause the boundary
If during the demarcation of the limit an obstacle is found in the path, such as trees, holes, stones, etc., the user can use the pause function to get around the obstacle.
When pressing the pause limit button , a red dot will appear on the map identified by the letter L, it’s the Alert Board with the message Limit break: OK. The end limit button will not be available, and the pause limit button will be replaced by the resume limit button 
. The figure below shows the navigation screen during limit pause.
To resume the demarcation, just press the resume limit button . The break point L 
will no longer be displayed in navigation, and it will be linked with a straight line 
to the current point of GNSS from the center of the implement bar. THE Alert Board will show the message Limit reset: OK. The following image shows the navigation screen when resuming the boundary demarcation.
The maneuver to get around obstacles can be done using the limit pause function or not. The differences are illustrated in the images below.
Finalize the boundary demarcation
The finalization of the demarcation of the limit can be accomplished in two ways. The first is done automatically, when returning from a distance less than 15 meters from the limit start point , as shown in the following figure. The second way is performed manually by pressing the end limit button 
.
When the limit is finalized, while the system is processing the limit calculation, the Alert Board with the message Caculando limite… Aguarde!. Then, after calculation, the alert board is updated with the message End of limit: OK. The limit line is then updated on the navigation screen, according to the Limit Type selected, changing from dashed to solid, in black. THE Information Board is also updated, showing the area data for the limit, according to the table below.
| Information | description |
|---|---|
| Total area | Polygon area generated by the boundary line |
| Applied Area | Area already applied within the boundary polygon |
| Remaining Area | Difference between Total area and the Applied Area |
Invalid threshold
The demarcation of a limit is invalidated whenever it crosses the line of a limit not yet finalized, as shown in the image below. The system GeoNave identifies the crossing of the line, and cancels the demarcation operation, displaying the message on the alert board Invalid threshold.
Use Limit menu
When a limit is properly marked on the navigation screen, the item is displayed within the settings during navigation Use Limit, as shown in the figure below. Through this menu it is possible to disable the limit by the option No, enable by option Yes, and Restart the limit for the demarcation of a new polygon.
Project type limit
When the Limit Type is configured as Project, the boundary polygon follows the project file in the format Shapefile selected. The boundary project is created by specific computer software, in which the agronomist determines the perimeter of the field in which the work will be carried out.
At File List limit projects, select the file SHP with desired name and press the preview button 
. The boundary design map will be loaded into memory and presented for user confirmation, via the Input Map screen, as shown in the example below.
If the user understands that the map shown is not the intended one, he must press the back button 
to return to the previous screen and select another project. If the limit design is chosen, when pressing the confirm button 
the map containing the boundary polygon will be loaded in the navigation screen, as shown in the figure below.
