SWITCH AS-ROCKER 2199523 - Caterpillar

GPS Position Error
The accuracy of a GPS position varies according to many different conditions. An RTK position is normally accurate enough for construction work. However, this is not always the case.When a GPS antenna is placed in a stationary position and the output of the position is monitored, there are small changes in the position. The change in the position is caused by noise in the solution. This results in a small error in the GPS position.The GPS error is an estimate of the amount of noise in the GPS positions.The Function of the GPS Receiver
The satellites are above the antenna so the horizontal and vertical accuracies are different. The vertical position is less accurate than the horizontal position. You can display the vertical position error and horizontal position error as text items. Refer to "GPS Accuracy Mode Text Items" for more information.Guidance to the cutting edge will only occur when the GPS accuracy for the antenna position is within the GPS error limit set for the GPS accuracy mode.GPS Accuracy Mode Text Items
Three text items that are related to GPS accuracy mode are available for display.
The "H. GPS Err." text item shows the GPS error in the horizontal plane.
The "V. GPS Err." text item shows the GPS error in the vertical plane.
The "GPS Acc. Mode" text item shows the currently selected GPS accuracy mode.The "H. GPS Err." text item and the "V.GPS Err." text item change color in order to indicate the current GPS error relative to the configured GPS Error Limit. The color coding that is used is shown in table 1.
Table 1
Text Color     GPS Error Indication    
Black     The GPS error is within 90% of the GPS error limit.    
Blue     The GPS error is within 10% of exceeding the GPS error limit.    
Red     The GPS error has exceeded the GPS error limit.    Setting the GPS Accuracy Mode and Limits
The operator can select a GPS accuracy mode. You can change the accuracy mode in normal mode, but you must be in service mode in order to change the GPS error limits.Perform the following steps in order to access the "GPS Accuracy Mode" dialog.
Turn the AccuGrade System on.
From any guidance screen, press the "GPS" soft key.
Illustration 1 g01300264
Press the "Change Mode" soft key (1) in order to change between the following modes: Fine Accuracy, Medium Accuracy and Course Accuracy.
Press "OK" in order to confirm the settings or press "ESC" in order to exit without saving.Note: If you press "ESC", you are asked to confirm that you do not want to save any changes.Editing The GPS Accuracy Modes
The AccuGrade System will need to be in service mode in order to edit the limits for the GPS accuracy mode.
Turn off the display.
Press and hold the "OK" key when you power up the display.Note: Hold the "OK" key until the start-up screen is displayed.
Select the "GPS" soft key from any guidance screen.
Illustration 2 g01320054
Press the "Edit Modes" soft key.The "GPS Accuracy Mode Settings" dialog