Garmin 255A Tuning LARGE/SMALL Concentric Cursor Knobs, FLIP/FLOP Key, 5 C/N Com/Nav Key, OBS Key

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1.2.3Tuning LARGE/SMALL Concentric (Cursor) Knobs

The LARGE right and SMALL right knobs are used for tuning frequencies and data entry.

LARGE, Outer Knob				SMALL, Inner Knob

1.2.4FLIP/FLOP Key

Press and release the FLIP/FLOP key to switch between the active (left-most) and standby (right-most) frequency. Switching between Com frequencies is disabled while you are transmitting.

1.2.5C/N (Com/Nav) Key

Press the C/N key to select the Com or Nav (VLOC) radio mode.

1.2.6OBS Key

Press the OBS key to see the current OBS setting and graphic CDI. The OBS page will be disabled if the unit is installed with an external converter.

1.2.7T/F (To/From) Key

Press the T/F key to toggle between the bearing TO or radial FROM the active VOR. The T/F page also shows Distance/Speed/ Time information. The T/F key does not operate for Localizer frequencies.

1.2.8CLR (Clear) Key

Pressing the CLR key erases information, cancels entries, and resets timers.

1.2.9ENT (Enter) Key

Press the ENT key to save selected values, to confirm a prompt, or to save the Standby frequency.

190-01182-01 Rev. A

Garmin GNC 255A/255B Pilot’s Guide

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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 2.1 2.22.3 Index Index-1 This page intentionally left blank Product Description Getting StartedPower/Com Volume/Squelch Knob Nav Volume/ID KnobPilot Controls OBS Key Tuning LARGE/SMALL Concentric Cursor KnobsFLIP/FLOP Key 5 C/N Com/Nav KeyUSB Port Func Function KeyMON Monitor Key Power On Com RadioSelecting a Com Frequency Monitoring the Standby Com Channel Saving a Com ChannelAfter selecting the desired characters, press ENT After making a selection, press ENT DescriptionFrequency Database Reverse Look-Up Com Database Look-UpEmergency Channel Stuck MicRemote Frequency Selection Control Nav Radio Selecting a Nav FrequencySaving a Nav Channel 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 FunctionsCom Frequencies Recent Com FrequenciesTurn the Small knob to select an Entry 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 ENTFunctions display ICS ConfigurationAdjust Intercom Turn the Small knob to display the available VORsTurn the Small knob to turn the Aux Audio On or Off Aux AudioSpeaker On/Off function. Then, press ENT Intercom On/OffSpeaker On/Off Intercom On/Off function. Then, press the ENT keyCom Spacing System Configuration34 Set Display Brightness Display BrightnessDatabase Version function. Then, press the ENT key Display ContrastDatabase Info Display Contrast function. Then, press the ENT keyLoad Database function. Then, press the ENT key Load DatabasePress the Func key to return to the main menu Software VersionSerial Number Software Version function. Then, press the ENT keyTimers Setting Up the Count Down TimerTo select a starting timer value Pressing ENT twice will stop the displayed Timer Setting Up the Count Up TimerViewing Timers in the Com Display Pressing CLR and then ENT will reset the displayed Timer48 Count Down Timer Value Now Counting Up This page intentionally left blank Appendix TroubleshootingCalibration error Recalibrate resolver It can be enabledOr disabled via a Remote mounted If in Lock Out modeUpdating the Frequency Database Messages Property with Power has been Re-apply power to the unitSwitch has been Verify glideslope deviationBeen in pressed All installationsInstallations Remote comNav radio is Contact dealer for service Not communicatingProperty with System This page intentionally left blank Index Remote frequency control 2-5 Reverse look-up 2-4 Revisions