Garmin 255A manual OBS Mode, CDI Display

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2.4OBS Mode

If your system is configured with an external CDI/HSI, the OBS radial of your remote display will be decoded and displayed on the screen of the GNC 255.

NOTE: The Identifier is the decoded Nav Identifier from the Morse code broadcast by the station.

1.Press the OBS key to see the current OBS setting and graphic CDI.

2.Use the LARGE and SMALL knobs to change the displayed OBS values.

The GNC 255 graphic CDI is shown as a graph of five dots right or left of the triangle icon. Each dot indicates two degrees deflection with ten degrees full deflection to each side. Fly towards the bar to be on-course.

Active Nav

Frequency

Identifier

OBS Setting

To/From Indication for

Selected Station

Reference Com

Frequency

CDI Deflection

Figure 2-14 CDI Display

2-8

Garmin GNC 255A/255B Pilot’s Guide

190-01182-01 Rev. A

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Contents GNC 255A/255B November Limited Warranty 190-01182-01 Rev. a Iii Operation Product Registration and Support US Toll Free Canada Toll FreeRecord of Revisions Contents 2.1 2.22.3 Index Index-1 This page intentionally left blank Getting Started Product DescriptionPower/Com Volume/Squelch Knob Nav Volume/ID KnobPilot Controls Tuning LARGE/SMALL Concentric Cursor Knobs FLIP/FLOP Key5 C/N Com/Nav Key OBS 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 Description After making a selection, press ENTCom Database Look-Up Frequency Database Reverse Look-UpEmergency Channel Stuck MicRemote Frequency Selection Control Nav Radio Selecting a Nav FrequencySaving a Nav Channel Listening to the Nav Audio Channel 01-36OBS Mode 14 CDI DisplayDistance/Speed/Time DST Display 15 DST Data DisplayThis page intentionally left blank Functions Functions DescriptionCom Frequencies Recent Com FrequenciesTurn the Small knob to select an Entry Com User Frequencies Press the CLR key to delete this User frequencyEditing a Com User Frequency Frequencies. Press ENTCom Database Frequencies Com Database FrequenciesCom Nearest Airports APT Nearest APT function. Then, press ENTCom Nearest Area Control Center ACC Frequencies Turn Small Knob To Scroll Through Available FrequenciesCom Nearest Flight Service Station FSS Frequencies 13 Com Nearest FSS FrequenciesCom Nearest Weather WX Frequencies 14 Com Nearest Weather FrequenciesNav Frequencies Recent Nav FrequenciesNav User Frequencies Press the ENT key to delete the displayed frequencyEditing a Nav User Frequency Nav Database Frequencies 21 Nav Database FrequenciesWhen duplicate identifiers are found, press ENT Nav Nearest VORICS Configuration Adjust IntercomTurn the Small knob to display the available VORs Functions displayAux Audio Turn the Small knob to turn the Aux Audio On or OffIntercom On/Off Speaker On/OffIntercom On/Off function. Then, press the ENT key Speaker On/Off function. Then, press ENTSystem Configuration Com SpacingDisplay Brightness 34 Set Display BrightnessDisplay Contrast Database InfoDisplay Contrast function. Then, press the ENT key Database Version function. Then, press the ENT keyLoad Database Load Database function. Then, press the ENT keySoftware Version Serial NumberSoftware Version function. Then, press the ENT key Press the Func key to return to the main menuTimers Setting Up the Count Down TimerTo select a starting timer value Setting Up the Count Up Timer Viewing Timers in the Com DisplayPressing 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 Troubleshooting AppendixIt can be enabled Or disabled via a Remote mountedIf in Lock Out mode Calibration error Recalibrate resolverUpdating the Frequency Database Messages Power has been Re-apply power to the unit Switch has beenVerify glideslope deviation Property withAll installations InstallationsRemote com Been in pressedNav 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