Garmin 255A manual

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 . Garmin International, Inc., 1200 East 151st Street, Olathe , KS 66062, U .S .A. T el[...]

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 date of purchase for new Remote-Mount and P anel-Mount products; one year from the date of purchase for new portable products and any purchased newly-o[...]

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 . Unauthorized repairs or modifications could voi[...]

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 . T his equipment generates , uses , and can radiate radio frequency energy and, if not installed and used in accordance with the instructions , may cause harmful interference to radio communications [...]

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 .garmin.com or https://fly .garmin.com/fly-garmin ). Look for the Product Registration link on [...]

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 ....................................................................................1-1 1.1 Product Description ...........................................[...]

viii Garmin GNC 255A/255B Pilot’ s Guide 190-01182-01 Rev . A 3 Functions ..............................................................................................3-1 3.1 Functions Description ........................................................................... 3-1 3.2 Com F requencies .................................................[...]

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 ..............................................................................................4-1 4.1 T roubleshooting ........................................................................[...]

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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. Besi[...]

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 . Contr ols are comprised of dual concentric knobs for frequency tuning, Com volume/squelch knob, Nav volume/[...]

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 . SMALL, Inner Knob LARGE, Outer Knob 1.2.4 FLIP/FLOP Ke y Press and release the FLIP/FLOP key to switch between the active (left-most) and standby (r[...]

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. Pressing the FUNC key a second time exits the Func[...]

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 Com Radio 2.2.1 Selecting a Com Frequency New frequencies are first se[...]

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 . A small “MN” will replace the ?[...]

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. Selected Wpt T ype Figure 2-4 Com User Frequency T ype Selection Frequency T ype Symbol Description TWR T ower GND Ground A TIS Automatic T erminal Information Service AWS A[...]

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 . T ur[...]

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 . Figure 2-9 Emergency Channel 2. T he Emergency Channel will be inserted into the Active F requency position and the previous Active Frequency will [...]

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. T urn the LARGE knob to change the values in o[...]

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. After selecting the desired characters , press ENT . Frequency T ype Symbol Description VO[...]

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. 1. Press the OBS k[...]

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. If you are not connected to an external sensor , you will not see this display . If DST data is[...]

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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). 3.1 Functions Description T imers Count Down ENT - Start/Stop CLR - Reset Push CRSR[...]

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. Press the ENT k ey to access the function. 5. Press the FUNC k ey again to exit Functions. 3.2 Com[...]

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. T his only affects the[...]

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. Press ENT . Select User Freqs Figure 3-5 Com Use[...]

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. Press FUNC to access the Functions . With the Com [...]

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. Press FUNC to access the Functions . With the Com[...]

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. ACCs are also known as Air Route T raffic Control Centers (AR TCC). T urn SMALL Knob T o Scroll T[...]

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. T urn SMALL Knob T o Scroll Through Available Frequencies Figure 3-13 Com Nearest FSS Fr equen[...]

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. Press FUNC to acce[...]

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.[...]

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 . T urn the LARGE knob to select the Nav F requency List Function. T urn the SMALL [...]

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. T urn the SMALL knob to select the desired Nav User frequency an[...]

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. Then, press ENT . [...]

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. T urn the SMALL knob to select the d[...]

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 . 3.4 ICS Configur ation The Internal Communications System (ICS) Configuration a[...]

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. T hen, press the ENT key. Figure 3-29 Select th[...]

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. 1. Press FUNC to access the Fu[...]

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[...]

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. A manual adjustment is available for controlling the brightness level of the [...]

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. 1. Press FUNC to access the Functions . T urn the LARGE knob to select t[...]

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 . 1. Insert the supplied cable into the USB port on the top right corner of the GN[...]

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 . 3.5.6 Software V ersion The software versions of the GNC 2[...]

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. 3.6.1 Setting Up the Count Down Timer 1. Press FUNC to access the Fu[...]

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. Now , press the ENT ke y. Select Count Up Timer Figure 3-44 Select the Count Up Timer Funct[...]

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 . Count Down Timer V alue Highlighted When Counting Up Figure 3-48 Count Down Timer[...]

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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. Please have the following information ready: • Systemconguration(products,ant[...]

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 switch F aulty electrical wiring or connection Contact your dealer to perform electrical system test No Nav audio Output disabled or set to a low leve[...]

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 4.2 Updating the Fr equency Database The GNC 255 uses a standard USB memory device to load the frequency data[...]

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. An acknowledged message will not be redisplayed even if the condition pe[...]

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. Contact dealer for service . [...]

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. This input is not available in all installations . V erify the COM[...]

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 . T his input will now be ignored. This input is not available in all installations . V erify the N[...]

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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 , 3-8 , 3-9 Com frequencies 3-2 Com PTT 3-18 Com radio 2-1 Com;Select frequency 2-1 Com spacing 3-18 Com user frequencies 3-3 Com volume 1-2 Contrast 3-2[...]

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 look-up 2-4 Revisions vi S Saving a com channel 2-2 Saving a nav channel 2-6 Serial Number 3-22 Software version 3-22 Speak er On/Off 3-17 Squelch 1-2 [...]

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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 800/525.6726 Fax. 503/364.2138 Garmin (Europe) Ltd. Liberty House, Bulls Copse Road, Hounsdown Bus[...]