Garmin aera 500 Series Pilot’s Guide190-01117-02 Rev. CAppendix A145Overview GPS Navigation Flight Planning Hazard Avoidance Additional Features Appendices IndexDATA FIELD & NUMERIC DATA OPTIONS (CONT.)Data Field/Numeric Data DefinitionTime of Day (Local) The current time and date in 12-hour or 24-hour format.Time (UTC) The current time and date in Universal (UTC)time.Vertical Speed The rate of climb or descent (GPS-derived).Vertical Speed Required The vertical speed necessary to decend/climbfrom a current position and altitude to thepreviously selected VNAV position and altitude,based upon current groundspeed.Weather (Altimeter) The altimeter setting at the nearest METARreporting station.Weather (Dew Point) The dew point at the nearest weather reportingstation.Weather (Rel. Humidity) The relative humidity at the nearest weatherreporting station.Weather (Temperature) The temperature at the nearest weatherreporting station.Weather (Wind) The wind speed and direction at the nearestweather reporting station.AURAL ALERTSTRAFFIC• “Traffic”—TIS-A traffic alert received.• “Traffic Not Available”—TIS-A service is not available or out of range.TERRAIN• “Five Hundred”—when the aircraft descends through 500 feet above the destina-tion airport.