Ag Leader GeoSteer Operation Manual - Manual (Page 123)

Precision Settings
Operator’s Manual 109
Figure 4-23 Precision Settings
The Precision Settings screen shows which mode is active at the top of the screen.
Changing Precision Mode
Each of the selections has specific accuracy levels and operational requirements. An explanation of each setting is provided
below:
Note: “Flex” is a term that denotes the system switching from one accuracy level to another when a correction source is lost. In
most cases, this happens when the RTK data link between the Base Station and the GeoSteer is interrupted. This could happen
due to radio or cell communication loss or an obstacle between the GeoSteer and the communication source (ex. Base Station
Radio Modem or Cell Tower). “Flex” will not help if the GPS signals from the satellites are blocked by obstacles such as trees
or buildings.
• RTK Only – This mode is only displayed if the RTK Feature Code has been unlocked on the GeoSteer. The system must
have a RTK source from a Base Station via a Radio Modem or from a NTRIP source via the Cell Modem. If selected, the
GeoSteer assumes the user must be 99.9% sure of position. It requires a RTK link at all times and will disengage
AutoSteering if the link is lost. This setting expects good satellite geometry and low PDOP. Because of the high accuracy
expectation, the chances that degraded conditions occur and stop AutoSteering is higher. Use only when high accuracy is
needed at all times.
• Flex High Accuracy (0-10 cm) – (0 to 3.9 inches) This mode is only displayed if the RTK Feature Code has been
unlocked on the GeoSteer. The system must have a RTK source from a Base Station or NTRIP stream. While receiving a
RTK signal, the system is just as accurate as RTK Only mode. However, this mode allows the system to lose the RTK data
link from the Base Station for a short time and allow the vehicle to continue to AutoSteering. When the RTK signal is lost,
the system will “Flex” back to WAAS/EGNOS or Autonomous Pass-to-Pass until the estimated error gets above 10 cm.
The amount of time allowed in flex mode depends on GPS conditions. The operator is warned when the system has entered
“Flex” mode and can decide if they wish to continue or wait for the RTK link to be reestablished.
• Flex Low Accuracy (0-30 cm) – (0 to 11.8 inches) This mode is only displayed if the RTK Feature Code has been
unlocked on the GeoSteer. This mode the same as Flex High Accuracy (0-10 cm) except the system will “flex” until the
estimated error gets above 30 cm. This will allow a longer period of operation with out a RTK signal, but it is possible the
system will have more position error the longer it does not have the RTK signal. However, as long as the RTK signal is
present, the system will be just as accurate as RTK Only. The operator is warned when the system has entered “Flex”
mode and can decide if they wish to continue or wait for the RTK link to be reestablished.
• OmniSTAR Only – This mode is only displayed if the GeoSteer detects that an OmniSTAR Demodulator has been
installed on the GeoDock. The system will use the OmniSTAR for corrections only and will not “flex” to any other mode if
the signal is lost. GeoSteer supports the OmniSTAR XP and HP signals only.