The Boundary corresponds to the field perimeter, the GeoNave system enables the user to draw a virtual line around the field, delimiting the useful area within which application must be performed. Boundary feature is recommended to be used with licenses that have section control – ISO 31, ISO 32, ISO 34, ISO 35 – since the functionality automatically closes sections when outside the area defined by boundary lines.
In the Settings during navigation menu, when the boundary is not yet defined, the Limit Pattern parameter will be shown, containing several options for boundary line creation.
With the exception of the Project limit type, the limit demarcation must be performed by the user, traveling with the machine directly over the field perimeter. The main difference between these types of Limit Pattern is the position in which the line is demarcated in relation to the implement boom center.
- Half Boom – The boundary line is demarcated exactly on the path taken by the implement boom center.
- External – Full Boom – The boundary line is demarcated at the implement boom outermost point, according to the direction (clockwise or counter-clockwise) performed in the field perimeter.
- Internal – Full Boom – The boundary line is demarcated at the implement boom innermost point, according to the direction (clockwise or counterclockwise) performed in the field perimeter.
- External – Custom – The limit line is demarcated at a distance determined by Limit Shift parameter, that will be enabled in the navigation settings menu if the limit pattern is External – Custom, measured from the implement boom central point 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 Limit Shift parameter, that will be enabled in the navigation settings menu if the limit pattern is Internal – Custom, measured from the implement boom center point towards its inner end, according to the direction (clockwise or counter-clockwise) performed in the field perimeter.
Start boundary delimiting
On the navigation screen, for limit patterns Half Boom, External – Full Boom, Internal – Full Boom, 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 machine path. It will also show the Alert Board with the text Limit start: OK and the limit pattern just below. The following image illustrates the boundary delimitation start for a Half Boom example.
After delimiting the boundary starting point, the button bar on the right side of the navigation screen will show two other buttons. The pause boundary button 
and, if the machine is more than 20 meters away from the start point, the end boundary button 
.
Pause boundary delimiting
If during the boundary delimitation 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 boundary button , a red dot will appear on the map identified by the letter L and an Alert Board with the message Limit Pause: OK. The end boundary button will not be available, and the pause boundary button will be replaced by the resume boundary button 
. The image below shows the navigation screen during boundary delimitation pause.
To resume the delimitation, just press the resume boundary button . The pause point L 
will no longer be displayed in navigation screen and it will be linked with a straight line 
to the current GNSS point of the implement boom center. An Alert Board will show the message Limit Restart: OK. The following image shows the navigation screen when resuming the boundary delimitation.
The maneuver to get around obstacles can be performed using the boundary pause function or not. The differences are illustrated in the images below.
Finalize boundary delimiting
The boundary delimiting finalization can be accomplished in two ways. The first is done automatically, when returning to a distance less than 15 meters from the boundary start point , as shown in the following image. The second way is performed manually by pressing the end boundary button 
.
When the boundary is finalized, while the system is processing the boundary calculation, an Alert Board with the message Calculating boundary… Please wait!. Then, after calculation, the alert board is updated with the message End of boundary: OK. The boundary line is then updated on the navigation screen, according to the Limit Pattern selected, changing from dashed to solid black. The Information Board is also updated, showing the boundary area data, according to the table below.
| Information | Description |
|---|---|
| Total area | Polygon area generated by the boundary line |
| Applied Area | Already applied area, within the boundary polygon |
| Remaining Area | Difference between Total area and the Applied Area |
Invalid boundary
A Boundary delimitation is invalidated whenever it crosses the line of a boundary not yet finalized, as shown in the image below. The GeoNave system identifies the line crossing and cancels the delimitation operation, displaying the message Invalid boundary on an alert board.
Limit Usage menu
When a boundary is properly delimited on the navigation screen, the Limit Usage item is displayed within the settings during navigation menu, as shown in the image below. Through this menu is possible to disable the boundary by the option No, enable by option Yes, and Restart for the demarcation of a new boundary polygon.
Project boundary
When the Limit Pattern is configured as Project, the boundary polygon follows the selected Shapefile project file. The boundary project is created through a specific computer software, in which the agronomist determines the perimeter of the field in which the work will be performed.
At boundary projects File List, select the SHP file desired and press the preview button 
. The boundary design map will be loaded into the memory and presented for user confirmation, via the Input Map screen, as shown in the example below.
If the user believes that the map shown is not the intended one, press the back button 
to return to the previous screen and select another project. If the boundary project is correct, by pressing the confirm button 
the map containing the boundary polygon will be loaded in the navigation screen, as shown in the image below.
