Garmin G2000 Pilots Guide - Page 53

SYSTTEEMM OVERVIIEEWW FLIGHT INSTRUMMEENTS EEIIS AAUUDD&IIOOCNP&ASCNNESL FLIGHT MANAGEEMMEENT System Overview measures of horizontal and vertical position uncertainty, are the current 95% confidence horizontal and vertical accuracy values reported by the GPS receiver. The current calculated GPS position, time, altitude, ground speed, and track for the aircraft are displayed below the satellite signal accuracy measurements. GPS receiver status The GPS solution type (ACQUIRING, 2D NAV, 2D DIFF NAV, 3D NAV, 3D DIFF NAV) for the active GPS receiver (GPS 1 or GPS 2) is shown in the right center of the GPS 1 and GPS 2 Status Pane. When the receiver is in the process of acquiring enough satellite signals for navigation, the receiver uses satellite orbital data (collected continuously from the satellites) and last known position to determine the satellites that should be in view. ACQUIRING is indicated as the solution until a sufficient number of satellites have been acquired for computing a solution. When the receiver is in the process of acquiring a 3D navigational GPS solution, 3D NAV is indicated as the solution until the 3D differential fix has finished acquisition. SBAS (Satellite-Based Augmentation System) indicates INACTIVE. When acquisition is complete, the solution status indicates 3D DIFF NAV and SBAS indicates ACTIVE. GPS Satellite Signal Strengths The GPS 1 and GPS 2 Status Display can be helpful in troubleshooting weak (or missing) signal levels due to poor satellite coverage or installation problems. As the GPS receiver locks onto satellites, a signal strength bar is displayed for each satellite in view, with the appropriate satellite PRN number (01-32 or 120-138 for WAAS) below each bar. The progress of satellite acquisition is shown in three stages, as indicated by signal bar appearance: - No bar-Receiver is looking for the indicated satellite - Hollow bar-Receiver has found the satellite and is collecting data - Light blue bar-Receiver has collected the necessary data and the satellite signal can be used - Green bar-Satellite is being used for the GPS solution - Checkered bar-Receiver has excluded the satellite (Fault Detection and Exclusion) - "D" indication-Denotes the satellite is being used as part of the differential computations Each satellite has a 30-second data transmission that must be collected (signal strength bar is hollow) before the satellite may be used for navigation (signal strength bar becomes solid). SBAS Selection In certain situations, such as when the aircraft is outside or on the fringe of the WAAS, EGNOS, or MSAS coverage area, it may be desirable to disable the reception of the applicable SBAS signal (although it is not recommended). When enabled, the annunciator on the applicable button shows green. Enabling/Disabling EGNOS, MSAS or WAAS 1) From Home, touch Utilities > GPS Status. 2) Touch the EGNOS, MSAS, or WAAS (any combination) Annunciator Button(s) to enable or disable. A green annunciation indicates an enabled SBAS selection. HAZARD AVOIDANCE AFCS ADDITIONAL FEATURES APPENDICES INDEX 190-01263-01 Rev. A Garmin G2000 Pilot's Guide for the Cessna T240 39