5Detailed OperationMonitoring and Recalling FrequenciesFrequency MonitoringThe Frequency Monitoring function allows you to listen to the Standby frequency, while monitoringthe Active frequency for activity.Press the MON button to listen to the standby frequency. A small “m” is displayed in front of theStandby frequency. When the Active frequency receives a signal, the unit will switch automatically to theActive frequency and then switch back when activity ceases. An arrow (< or >) will point to the frequencythat you are currently listening to. A slight clicking sound occurs when the radio is checking the Activefrequency for activity. The Monitor function is deactivated when you press MON.Recalling a FrequencyThe SL40 can access several areas of stored frequencies. The SL40 can also receive airport frequenciesif connected to certain GPS receivers.Remote (REM)The Remote function will allow the SL40 to access the airport frequency database in an GPS receiver.Press RCL to view the Remote (REM) frequencies. Then, turn the Small, inner knob to display theavailable frequencies. The waypoint type and frequency are displayed.If not connected to an GPS, or the list is not received, the list will not be available.TWR - Tower frequencyGND - Ground frequencyATS - ATIS frequencyATF - Air Traffic FrequencyAPP - ApproachARR - ArrivalAWS - Automatic Weather StationCLR - Clearance/DeliveryCTF - Common Traffic AdvisoryFrequencyDEP - Departure frequencyFSS - Flight Service StationRFS - Remote Flight Service StationUNI - Unicom frequencyMF - Mandatory FrequencyFrequency Abbreviations119.10 > m121.50Monitoring a Frequency119.10 REM SLE119.10 ATS124.55Recalling a Remote Frequency