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Viper/Viper 4+ Installation & Operation Manual
FIXED CONTOUR
The Fixed Contour pattern is ideal for creating and saving swaths which follow irregular field boundaries,
waterways, well heads, etc., or where the ability to skip swaths in an irregular pattern is necessary.
The fixed contour pattern is created by setting the first, or “A,” point and driving the first full swath before setting
the second, or “B,” point. ROS will then connect points recorded along the first swath and displays the fixed
contour path.
As long as the fixed contour pattern is active and the original path is available, ROS will use the initial swath and
programmed equipment width to calculate contours for the rest of the coverage area nearest path regardless of
previous application history or coverage mapping.
NOTE:
Curvature of the fixed contour guidance path should not be too aggressive. Overly aggressive curves
may produce undesirable results. Always be aware of sharp turns when using the fixed contour
pattern if an assisted steering system such as Raven SmarTrax system is engaged. Contact a local
Raven dealer for more information about Raven assisted steering systems.
See the Setting Guidance Paths section on page 151 for assistance with using the AB utilities with the fixed contour
guidance pattern.
LAST PASS
FEATURES AND USES
Last Pass is best used for applying around the headlands of a field, in U shaped areas, and circular patterns.Last
Pass creates a guidance path based on previous coverage in a field. Every two seconds, last pass searches for a
piece of coverage (previously applied area) in order to maintain the guidance path.
ENHANCEMENT
Depending on the shape or location in the field, last pass could cause the guidance path to "bounce" between two
pieces of coverage. When using auto-steering, the machine would attempt to stay on the now "bouncing"
guidance line, causing the machine to hard weave from side to side. This typically occurred in situations where two
areas of previous coverage were close together, such as valleys and the very last pass of a field.Last Pass has been
enhanced to now cause the current pass to tether to an anchor point along the previous pass. It looks
approximately 40 meters ahead and behind the anchor point to maintain the tether, keeping the current pass from
jumping to another nearby piece of coverage.
WHEN NOT TO USE LAST PASS
Do not use Last Pass while making swaths back and forth across a field. It can often cause what is referred to as
"line straightening” or “line smoothing.” Line straightening / smoothing occurs when the guidance path gradually
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