Instruction/ maintenance manual of the product 255A Garmin
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GNC 255A/255B Pilot’ s Guide.
© 2012 Garmin Ltd. or its subsidiaries . All rights reserved. T his manual reflects the operation of System Softw are version 2.00, or later . Some differences in operation may be observed when comparing the information in this manual to later software versions .
i 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide LIMITED W ARRANTY All Garmin avionics products are warr anted to be free from defects in materials or workmanship for: two years from the d.
ii Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A W ARNING: F or safety reasons , GNC 255 operational procedures must be learned on the ground. CA UTION : The Garmin GNC 255 does not contain any user -serviceable parts . Repairs should only be made by an authorized Garmin service center .
iii 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide NO TE : Canadian installations: In accordance with Canadian Radio Specifications Standard 102 (RSS 102), RF field strength exposure to persons from an antenna connected to this device should be limited to 60 V/m for controlled environment and 28 V/m for uncontrolled environment.
iv Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A NO TE: This device complies with P art 15 of the FCC limits for Class B digital devices .
v 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide Pr oduct Registration and Support Help us better support you by completing your online registration today! Have the serial number of your product handy and connect to the Garmin web site (www .
vi Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A Record of Revisions P art Number Revision Date Description 190-01182-01 A 11/19/12 Initial release.
vii 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide Contents Product Registration and Support ......................................................................v 1 Getting Started ........................................................
viii Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 3 Functions ..............................................................................................3-1 3.1 Functions Description ...................................................
ix 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 3.6.3 Viewing T imers in the Com Display ....................................... 3-24 4 Appendix ............................................................................................
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1-1 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 1 GETTING ST ARTED 1.1 Pr oduct Description Combining a powerful VHF communications transceiver with 200 channel VOR, Localizer and Glideslope receivers, the GNC 255 pr ovides a full-functioned navigation and communications solution in a small footprint at a very affor dable price.
1-2 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 1.2 Pilot Contr ols The GNC 255 controls have been designed to simplify operation of the system and minimize workload and the time required to access sophisticated functionality .
1-3 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 1.2.3 T uning LARGE/SMALL Concentric (Cursor) Knobs The LARGE right and SMALL right knobs are used for tuning frequencies and data entry .
1-4 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 1.2.10 FUNC (Function) K ey The FUNC (Function) key accesses function categories for the following: the Com Radio, Nav Radio, ICS Configuration, System Configuration, and T imer . Pressing the FUNC key once displays the Function mode.
2-1 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 2 B ASIC OPERA TION 2.1 Power On T urn the GNC 255 on by either tur ning the Power/Com V olume/ Squelch knob clockwise to turn the power on or , if installed, turning on the master switch that powers the radios.
2-2 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 2.2.2 Monitoring the Standby Com Channel The Frequency Monitoring function allows you to monitor the Standby frequency for activity , while listening to the Active frequency . Press the MON key in the Com function to listen to the standby frequency .
2-3 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 5. T urn the LARGE knob to select the waypoint T ype . 6. T urn the SMALL knob to select the T ype from the list.
2-4 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 2.2.4 Com Database Look-Up 1. Press the CURSOR knob from the Com display to activate the database look-up function. Identifier Field Active for Selection T urn LARGE Knob T o Move Cursor T urn SMALL Knob T o Select Character Figure 2-5 Database Identifier Active for Selection 2 .
2-5 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 2.2.6 Emergency Channel 1. Press and hold the FLIP/FLOP k ey or the Com Remote T ransfer (COM RMT XFR) k ey for approximately two seconds .
2-6 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 2.3 Nav Radio 2.3.1 Selecting a Nav Frequency The selection of Nav frequencies is the same as for the Com frequencies. 1. Press the C/N k ey to reach the Nav radio function. The NA V annunciator on the top line of the display will show .
2-7 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 5. T urn the LARGE knob to select the waypoint T ype . 6. T urn the SMALL knob to select characters . 7. T urn the LARGE knob to move the cursor . Figure 2-12 Nav User Frequency T ype Selection 8.
2-8 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 2.4 OBS 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. NO TE : T he Identifier is the decoded Nav Identifier from the Morse code broadcast by the station.
2-9 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 2.5 Distance/Speed/T ime (DST) Display When the GNC 255 has received data fr om an exter nal device, such as a GPS receiver or DME sensor thr ough the serial port, DST data will be available.
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3-1 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 3 FUNCTIONS The Functions section allows pr ovides information about Com Frequencies, Nav Frequencies, Internal Communications System (ICS) Configuration, System Configuration (SYS), and T imers (TMR).
3-2 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 1. Press the FUNC k ey to access the Functions. 2. T urn the LARGE knob to select the COM, NA V , ICS , or SY S functions . 3. T urn the SMALL knob to view the choices in each function. 4.
3-3 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 3.2.2 Com User Frequencies Fifteen Com User Frequencies can be saved with an assigned waypoint (WPT) identifier and T ype. NO TE : When switching from 8.33 kHz to 25 kHz mode , any 8.33 kHz- specific user frequencies will be deleted from the user frequency list.
3-4 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 2 . Press the ENT k ey to confirm deletion of the displayed frequency . 3.2.2.3 Editing a Com User Frequency 1. Press FUNC . T urn the LARGE knob to reach the Com functions and then turn the SMALL knob to select the Com User F requencies.
3-5 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 3.2.3 Com Database Frequencies The GNC 255 contains a lar ge database of Com frequencies that may be recalled by identifier . T urn LARGE Knob T o Move Cursor T urn SMALL Knob T o Select Character Figure 3-9 Com Database Frequencies 1.
3-6 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 3.2.4 Com Nearest Airports (APT) The GNC 255 will report the 25 nearest Airports (APT), when interfaced with an appropriate GPS r eceiver . T urn SMALL Knob T o Scroll Through Available Airports Figure 3-11 Com Nearest APT Frequencies 1.
3-7 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 3.2.5 Com Nearest Area Control Center (A CC) Frequencies The GNC 255, when interfaced with an appropriate GPS r eceiver , will report the 25 nearest Area Contr ol Center (ACC) frequencies.
3-8 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 3.2.6 Com Nearest Flight Service Station (FSS) Frequencies The GNC 255, when interfaced with an appropriate GPS r eceiver , will report the 25 nearest Flight Service Station (FSS) frequencies.
3-9 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 3.2.7 Com Nearest W eather (WX) Frequencies The GNC 255, when interfaced with an appropriate GPS r eceiver , will report the 25 nearest W eather (WX) frequencies. T urn SMALL Knob T o Scroll Through Available Frequencies Figure 3-14 Com Nearest W eather Frequencies 1.
3-10 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 3.3 Nav Fr equencies The Nav Frequencies category in the Functions section contains remotely acquired frequencies (Remote), r ecently used frequencies (Recent), user -defined frequencies (User), and a database of all fr equencies provided in the standar d default memory (Database).
3-11 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 3.3.2 Nav User Frequencies Up to 15 Nav User Frequencies can be saved with an assigned waypoint (WPT) identifier and T ype. 3.3.2.1 Viewing the Nav User Fr equency 1. Press FUNC to access the Functions .
3-12 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 3.3.2.3 Editing a Nav User Frequency 1. Press FUNC . T urn the LARGE knob to reach the Nav functions and then turn the SMALL knob to select the Nav User F requencies. Press ENT . Figure 3-18 Nav User Frequency Function 2.
3-13 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 3.3.3 Nav Database Frequencies The GNC 255 contains a large database of Nav fr equencies that may be recalled by identifier . 1. Press FUNC to access the Functions . With the Nav F requency Function highlighted, turn the SMALL knob to view the Nav Database function.
3-14 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A Duplicate Identifiers 1. When duplicate identifiers are found, press ENT . Duplicate Identifiers Found Press the ENT Key to Save the Displayed V alue Press the CLR Key T o Return to the Previous Menu Figure 3-23 Selected Nav Database Frequency 2.
3-15 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 2. T urn the SMALL knob to display the available VORs . 3. Press the ENT k ey to accept the displayed VOR and set it as the Standby frequency . Or , press the CLR k ey to return to the Functions display .
3-16 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 3.4.2 Aux Audio The Aux function allows you to turn Aux Audio On/Off and set the volume value. 1. Press FUNC to access the Functions . T urn the LARGE knob to select the ICS Function. T urn the SMALL knob to view the Aux V olume function.
3-17 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 3.4.3 Intercom On/Off The Intercom On/Of f function toggles intercom on and of f. The intercom can also be toggled on/off with a r emote switch, if installed. The Intercom On/ Off function must be set to On to make the Adjust Inter com function available.
3-18 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 3.5 System Configur ation The System Configuration function will show the Software V ersion, Database Info, and Serial Number as well as, allowing you to set values for the Com spacing, Display Brightness, and Display Contrast, and use the Load Database feature to update databases.
3-19 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 3.5.2 Display Brightness As it arrives from the factory , the GNC 255 automatically adjusts its display brightness for the current lighting conditions. A small sensor on the display is used for this function.
3-20 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 3.5.3 Display Contrast The Display Contrast has a range fr om -50 (Low Display Contrast) and 50 (High Display Contrast) with 0 as the default. The range can be adjusted by using the SMALL knob to adjust the value.
3-21 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 3.5.5 Load Database The GNC 255 has a USB connector to allow for easily updating the system databases. NO TE : Garmin recommends the use of a USB 2.0 compatible USB flash drive for updating the database .
3-22 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 5. Wait until the updating process is complete and then remove the memory device and cable . T he unit will reset automatically once the database is updated. 6. V erify the correct frequency database is loaded after power -up .
3-23 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 3.6 T imers The GNC 255 has both Count Up and Count Down timers, which may operate simultaneously and are shown in the lower right of the Com/Nav displays. The countdown timer always takes precedence if it is running.
3-24 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 3.6.2 Setting Up the Count Up Timer 1. Press FUNC to access the Functions . T urn the LARGE knob to select the T imer (TMR) function. T urn the SMALL knob to select the Count Up T imer function.
3-25 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide When the Count Down T imer reaches 0:00, it will continue counting as a Count Up value. The Count Down T imer that is counting up will be highlighted. A Count Up T imer will continue counting separately .
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4-1 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide 4 APPENDIX 4.1 T r oubleshooting If efforts to r esolve the problem fail, contact your dealer or the factory for technical assistance. The Garmin customer service staff will gladly assist you.
4-2 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A Problem P ossible Cause Action GNC 255 does not power on No power to the GNC 255 Check power connections , break ers , and main avionics .
4-3 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide Problem P ossible Cause Action Display shows “Incorrect Calibration Checksum” at start-up Corrupted system calibration parameters Contact factory T able 4-1 T roubleshooting 4.
4-4 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 4.3 Messages When a Message has been issued by the unit, the Message will be shown on the display . After viewing the messages, touch the ENT key to acknowledge the message and return to the previously viewed page.
4-5 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide Message Description Action COOLING F AN - T he cooling fan has failed. T he GTN cooling fan is powered, but it is not turning at the desired RPM. Decrease cabin temperature and increase cabin airflow (especially near the GTN) to prevent damage to the unit.
4-6 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A Message Description Action REMO TE KEY STUCK - Com remote transfer k ey is stuck. T he remote com transfer (COM RMT XFR) k ey/switch has been in pressed position for at least 30 seconds . T his input will now be ignored.
4-7 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide Message Description Action REMO TE KEY STUCK - Nav remote transfer k ey is stuck. T he remote nav transfer (NA V RMT XFR) k ey/ switch has been in pressed position for at least 30 seconds .
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Index-1 190-01182-01 Rev . A Garmin GNC 255A/255B Pilot’ s Guide INDEX A Appendix 4-1 B Basic operation 2-1 Brightness 3-19 C Cautions ii , 2-6 Clear 1-3 Com database frequencies 3-5 , 3-6 , 3-7 , 3.
Index-2 Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A R Recent com frequencies 3-2 Recent nav frequencies 3-10 Record of Revisions vi Registration v Remote frequency control 2-5 Reverse l.
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© 2012 GARMIN Corporation GARMIN International, Inc. 1200 East 151 st Street, Olathe, Kansas 66062, U.S.A. T el. 913/397.8200 or 800/800.1020 Fax 913/397.8282 Garmin A T , Inc. 2345 T urner Rd., S.E., Salem, Oregon 97302, U.S.A. T el. 503/581.8101 or 800/525.
An important point after buying a device Garmin 255A (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Garmin 255A yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Garmin 255A - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Garmin 255A you will learn all the available features of the product, as well as information on its operation. The information that you get Garmin 255A will certainly help you make a decision on the purchase.
If you already are a holder of Garmin 255A, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Garmin 255A.
However, one of the most important roles played by the user manual is to help in solving problems with Garmin 255A. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Garmin 255A along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
