RING 4N7595 - Caterpillar

Introduction
As a default, "GNSS Accuracy Mode" dialog is available for all configurations of the Cat Grade Control system. The contents of the "Setup Menu" may vary depending on the "Operator Configuration" settings of your system and the machine settings. Refer to your supervisor if a specific option is not available. Use the "GNSS Accuracy Mode" dialog to set the maximum "GNSS error estimate" that is acceptable for your application. If the "GNSS error estimate" exceeds the limits defined for the selected mode, a "Low Accuracy GNSS" message is shown on the display and the monitor will sound a short audible.Note: Blade corrections will continue to be made in low accuracy mode based on the available position information, but system performance may be degraded. No blade position corrections will be made if GNSS signal is lost completely.There are three GNSS accuracy modes:
Fine
Medium
CoarseYour supervisor sets the limit for each mode to suit the type of work being done, and these modes can be deactivated. The operator must determine if the system performance in low accuracy mode is acceptable for the application. If not, then actions to correct the issues causing low accuracy mode will have to be taken.Note: The system can transition to low accuracy mode or lose GNSS signal due to radio frequency interference in the L1, L2, or GLONASS frequency bands. Radio frequency can be caused by the following, an obstructed view of the sky due to buildings, vegetation, other structures, the number of available satellites above the operating location at a given time, or problems with the base system being used to receive corrections.The limits for fine mode are set for finish trim work. If GNSS accuracy is not within the tolerance set for fine mode, do not change into coarse mode to continue work on your final trim surface. Instead, do one of the following:
Wait for the GNSS accuracy to improve and then continue in fine mode.
Change the GNSS Accuracy mode and then continue working on an area that does not require "Fine" mode GNSS accuracy.
Change the GNSS Accuracy mode and then raise the vertical offset in order to leave the constructed surface high. Return to the area when the GNSS accuracy has improved and allows "Fine" mode operation. This change allows the operator to continue working on the same area of the design and not overcut the final design surface.Your site manager also sets the auto setting. The setting determines what GNSS accuracy is required before automatic controls can be activated. The "GNSS Accuracy Mode" dialog displays a "Yes" in the auto column if controls are available.GNSS Accuracy Mode Text Items
Three text items that display the current GNSS accuracy level can be displayed on the guidance views:
H. GNSS Err.
V. GNSS Err.
GNSS Acc. ModeThe color of the text item shows whether the current