Chapter 7
174 OmniSeed™ Viper Pro™ Installation & Operation Manual
Setting the Zero Rate Tolerance.
1. To set the zero rate tolerance for each node from the Viper Pro main screen, touch Menu, then Setup,
Maps, and Cov Map.
2. Select the Next button on the Coverage Map Colors screen to display the Zero Rate Tolerance screen.
3. Touch the desired product field and use the on-screen keyboard to enter the minimum rate allowed before
the field computer will record coverage.
Prescription (Rx) Maps
Prescription (Rx) maps may be loaded onto the Viper Pro field computer for automatic variable rate
applications based upon rate zones referenced within the prescription map shapefile. The Viper Pro is capable
of controlling up to five products in reference to individual maps for each product or a single map containing the
prescription rate information for each product in the .dbf file of the shapefile format.
The following table is an example of the .dbf file for a single map that contains multiple product information.
Note: In order to control multiple products according to a prescription map, a multi-product activation key
must be entered on the Viper Pro. Contact a local Raven dealer to obtain a multi-product VRA
activation key and refer to the Registering the Viper Pro section on page 23 for information on
entering activation keys on the Viper Pro field computer.
If the prescription map contains zero rate zones, the product node or control channel must have
either a PWM close or fast close valve controlling the corresponding product. Refer to the
Application and Control Valve Type(s) section on page 40 for information on setting the valve type
on the Viper Pro.
If the system contains a fast valve, the valve must be plumbed into the main product line. Do not
plumb the valve into a bypass line.
Prescription maps used with the Viper Pro must be in the shapefile format and must be created using GIS
(Geographic Information System) software capable of creating shapefiles. These shapefiles must be in the
polygon shape format that complies with the ESRI (Environmental Systems Research Institute) shapefile
specifications. Shapefiles must also be in the WGS84 datum.
Nitrogen Potassium Phosphorus Lime
100.0 20.0 15.0 750.0
125.0 17.0 33.0 200.0
85.0 45.0 21.0 600.0
50.0 0.0 18.0 925.0
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