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Document #1022 rev1.8
Pivot guidance
Description
Basic pivot guidance is guidance around concentric circles. The circles are
defined by three waypoints (A, B, and C)along the circumference. Each
point must be at least 30 metres from the last which means a minimum
radius of about 15 metres.
To achieve the best results, the three points should be equally spaced
around the circle (e.g. 0, 120 and 240 degrees).
The circle is projected around the centre point, assuming relatively flat
terrain. Variations in the ground will reduce the accuracy in the guidance
lines. Slopes can have a large effect so it is recommended that the system
not be used on slopes exceeding 2 degrees. A slope will have the effect
that the circle will appear oval with the highest and lowest points being the
most affected. To best combat this, it is advised that the waypoints be set
mid way between the most inner and outer working line. The table below
represents the maximum error that can be expected on the defined slopes.
Hilly ground should be avoided as the inaccuracies introduced by the
ground will create undesirable results.
It is recommended that pivot guidance be used in RTK mode.
B
A
C
