To modify the painting of the selected map you must use the scale edit box 
.
You must adjust the scale according to the application rate used in the GeoNave during operation. Values must be entered in ascending order (smallest to largest). For a Spray application map the scale configured with the following values 
will paint the map according to the rate values below:
Resulting in map painting:
When you finish editing the scale of values, just click on the “Save” option that appears only when some value of the scale is modified.
A save processing message will be displayed on the screen:
When the color processing is finished, a confirmation message will appear on the screen informing the map on which the change occurred:
When in preview mode with the second map open, both will have individual scale control, allowing you to compare application rate and speed information, for example:
