Garmin GPS 152 Owner's Manual - Page 76

Receiver Status Reference Main Menu: GPS Tab Estimated Accuracy DOP GPS Tab With WAAS Disabled 66 • 3D Navigation - At least four satellites with good geometry have been acquired and your position is now being calculated in latitude, longitude and altitude. '3D Differential Navigation' will appear when you are receiving DGPS or WAAS corrections in 3D mode and a 'D' will show on the strength bar of satellites being corrected. • Poor GPS Coverage - The receiver is no longer tracking enough satellites for a 2D or 3D fix. • Receiver Not Usable - The receiver is unusable, possibly due to interference or abnormal satellite conditions. Turn the unit off and back on to reset. • Simulating Navigation - The receiver is in simulator mode. The 'DGPS Rcvr' and 'Diff SNR' fields appear below the 'Accuracy' and 'DOP' fields. The Differential Receiver status field will show one of the following: • Off - No optional beacon receiver attached or enabled in the Com menu. • WAAS - WAAS capability enabled. DGPS • No Signal - DGPS receiver attached, but not transmitting RTCM data to GPS. Status • Tuning - Receiver is tuning manual frequency. • Scanning - DGPS receiver is scanning for available frequency. • Rcving - Unit is receiving DGPS corrections. • Chk Wiring - DGPS is enabled in Com menu, but no DGPS receiver attached or bad corrections. The Differential SNR (Signal to Noise Ratio) indicates, on a scale to 0-30db with 30db being the best, the strength of the DGPS signal being received. If no optional DGPS receiver is used with the GPS 152, the 'DGPS Rcvr' field will display 'Off' and the 'DGPS SNR' field will be blank. The SNR will depend upon the mounting of your DGPS receiver and the distance from the DGPS transmitting station.