Garmin GTN 650 Pilot's Guide - Page 262

Foreword 14.3 RAIM Prediction RAIM Prediction predicts if GPS coverage is available for your current location Getting Started or at a specified waypoint at any time and date. RAIM performs checks to ensure that the GTN unit has adequate satellite geometry during your flight. Xpdr Ctrl RAIM availability is near 100% in Oceanic, En Route and Terminal phases of flight. Because the FAA's TSO requirements for non-precision approaches Com/Nav specify significantly better satellite coverage than other flight phases, RAIM may not be available when flying some approaches. The GTN unit FPL automatically monitors RAIM during approach operations and warns you if Direct-To RAIM is not available. In such cases, use a non-GPS based approach. RAIM prediction helps you plan for a pending flight to confirm GPS operation during Proc an approach. RAIM prediction only predicts the availability of Fault Detection (FD) Wpt Info integrity in the absence of SBAS corrections. It cannot predict the availability of LPV or L/VNAV approaches. The FAA provides a NOTAM service for LPV Map approach availability. Traffic Terrain Weather Nearest Music Utilities 1. While viewing the Utilities page, touch the RAIM Prediction key. Touch To Select Destination Waypoint Touch To Select Local Arrival Date Touch To Select Local Arrival Time Figure 14-13 Utility RAIM Prediction Page System Messages Symbols Appendix 2. Touch the Waypoint key and select the waypoint for RAIM Prediction. 3. Touch the Arrival Date key and select the date of arrival at the selected waypoint. 4. Touch the Arrival Time key and select the local time of expected arrival at the selected waypoint. Index 14-10 Garmin GTN 625/635/650 Pilot's Guide 190-01004-03 Rev. B