In the Visualize area of variable rate map management, the user has access to data from files Shapefile variable rates loaded into the monitor’s internal memory IsoView.
By selecting the item from the menu Variable Rate Maps and press the confirm button 
, the user is presented with the File List, as shown in the figure below, through which the variable rate map for which information is to be viewed is selected.
the files Shapefile of variable rate maps are presented in the table with the type “SHP”, and are organized in the internal memory with the same folder structure present in the portable memory at the time of import. The user can browse through the folders in the internal memory until he finds the file SHP you want to manage. When selecting the desired file, the distance from the current coordinates of the GNSS to map area.
Pressing the view button 
, the input map parameters screen is displayed, as in the following image, through which the user must select which of the information contained in the file with extension “.DBF” will be used to generate the polygon map.
By pressing the forward button 
, screen is displayed. Loading with the text “Loading file” while the file is loaded from internal memory so that the variable rate map is displayed on the screen. After loading, the map appears on the screen as shown in the following figure..
The variable rate map visualization screen contains a legend, which indicates the colors represented on the map for each range of the chosen parameter. On this screen, when pressing the back button 
return to the previous screen.
Also in the Visualize area, it is possible to delete a variable rate map file through the delete button 
. When pressing the button, the screen in the figure below will be shown, containing the frame with a red background to draw attention to the deletion, informing the names of the 3 files (SHP, DBF, SHX) that make up the variable rate map.
If the user presses the cancel button 
, the deletion will not be performed and you will be returned to the previous screen. If the confirm button is pressed , the variable rate map file will be erased from internal memory and the Information containing the confirmation will be displayed, as shown in the following image.
