Garmin 255A manual Power On, Com Radio, Selecting a Com Frequency

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2 BASIC OPERATION

2.1Power On

Turn the GNC 255 on by either turning the Power/Com Volume/ Squelch knob clockwise to turn the power on or, if installed, turning on the master switch that powers the radios.

2.2Com Radio

2.2.1Selecting a Com Frequency

New frequencies are first selected as a Standby frequency and then toggled to the Active side with the FLIP/FLOP key. While viewing the Standby frequency display, use the LARGE and SMALL knobs on the right side of the GNC 255 to select the desired frequency.

1.Press C/N, if necessary, to reach the Com radio function. The COM annunciator on the top line of the display will show.

2.Turn the LARGE knob to change the values in one MHz increments. The MHz selection range is between 118 and 136 in one MHz steps.

3.Turn the SMALL knob to change the values in 25 kHz or 8.33 kHz increments. The kHz selection range is between 000 and 975 kHz in 25 kHz steps or 000 and 990 kHz in 8.33 kHz steps.

4.Turn the LARGE and SMALL knobs clockwise to increase and counterclockwise to decrease the frequency values. Standby frequency selection is not inhibited during transmit.

5.When connected to a position source, nearby station identifiers will be shown for the selected frequency. Frequencies with multiple types will have an asterisk next to the identifier.

Identifier and Type Shown For

The Selected Frequency

Asterisk Indicates Multiple Types Exist For The Selected Frequency

Figure 2-1 Com Frequency Selection

6.Press and release the FLIP/FLOP key to toggle the Standby frequency to the Active frequency.

190-01182-01 Rev. A

Garmin GNC 255A/255B Pilot’s Guide

2-1

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Contents GNC 255A/255B November Limited Warranty 190-01182-01 Rev. a Iii Operation US Toll Free Canada Toll Free Product Registration and SupportRecord of Revisions Contents 2.3 2.12.2 Index Index-1 This page intentionally left blank Product Description Getting StartedPilot Controls Power/Com Volume/Squelch KnobNav Volume/ID Knob FLIP/FLOP Key Tuning LARGE/SMALL Concentric Cursor Knobs5 C/N Com/Nav Key OBS KeyMON Monitor Key USB PortFunc Function Key Selecting a Com Frequency Power OnCom Radio After selecting the desired characters, press ENT Monitoring the Standby Com ChannelSaving a Com Channel After making a selection, press ENT DescriptionFrequency Database Reverse Look-Up Com Database Look-UpRemote Frequency Selection Control Emergency ChannelStuck Mic Saving a Nav Channel Nav RadioSelecting a Nav Frequency 01-36 Listening to the Nav Audio Channel14 CDI Display OBS Mode15 DST Data Display Distance/Speed/Time DST DisplayThis page intentionally left blank Functions Description FunctionsTurn the Small knob to select an Entry Com FrequenciesRecent Com Frequencies Press the CLR key to delete this User frequency Com User FrequenciesFrequencies. Press ENT Editing a Com User FrequencyCom Database Frequencies Com Database FrequenciesNearest APT function. Then, press ENT Com Nearest Airports APTTurn Small Knob To Scroll Through Available Frequencies Com Nearest Area Control Center ACC Frequencies13 Com Nearest FSS Frequencies Com Nearest Flight Service Station FSS Frequencies14 Com Nearest Weather Frequencies Com Nearest Weather WX FrequenciesRecent Nav Frequencies Nav FrequenciesPress the ENT key to delete the displayed frequency Nav User FrequenciesEditing a Nav User Frequency 21 Nav Database Frequencies Nav Database FrequenciesNav Nearest VOR When duplicate identifiers are found, press ENTAdjust Intercom ICS ConfigurationTurn the Small knob to display the available VORs Functions displayTurn the Small knob to turn the Aux Audio On or Off Aux AudioSpeaker On/Off Intercom On/OffIntercom On/Off function. Then, press the ENT key Speaker On/Off function. Then, press ENTCom Spacing System Configuration34 Set Display Brightness Display BrightnessDatabase Info Display ContrastDisplay Contrast function. Then, press the ENT key Database Version function. Then, press the ENT keyLoad Database function. Then, press the ENT key Load DatabaseSerial Number Software VersionSoftware Version function. Then, press the ENT key Press the Func key to return to the main menuTo select a starting timer value TimersSetting Up the Count Down Timer Viewing Timers in the Com Display Setting Up the Count Up TimerPressing CLR and then ENT will reset the displayed Timer Pressing ENT twice will stop the displayed Timer48 Count Down Timer Value Now Counting Up This page intentionally left blank Appendix TroubleshootingOr disabled via a Remote mounted It can be enabledIf in Lock Out mode Calibration error Recalibrate resolverUpdating the Frequency Database Messages Switch has been Power has been Re-apply power to the unitVerify glideslope deviation Property withInstallations All installationsRemote com Been in pressedProperty with System Nav radio is Contact dealer for serviceNot communicating This page intentionally left blank Index Remote frequency control 2-5 Reverse look-up 2-4 Revisions