GARMIN PANEL MOUNT
CM WP ME HA AP LG EP CS IN EL AV TO PS BV
The GNC 300XL combines goanywhere GPS flight navigation with full 760-channel VHF communications. On the Comm side, a full powered 760 channel transceiver with 5W minimum transmit power delivers crisp, clear cockpit audio and voice transmissions. Comm features auto-squelch control, standard headset output with sidetone and audio leveling, stuck mike transmission timeout, emergency channel select and autotune freq. selection from database card. The Nav side features Garmins easy-to-use PhaseTrac 12 parallel channel GPS receiver. Waypoint library holds up to 1,000 user-defined waypoints ans stores up to 20 reversible flight plans with up to 31 waypoints each. Jeppesen NavData database includes SUAs, MSAs, airports, VORs, NDBs, intersections, plus airport, FSS and center frequencies, nearest search of 9 airports, VORs, NDBs, intersections and user waypoints and 2 nearest FSS and ARTCC frequencies and all published GPS and GPS overlay approaches, SIDs and STARs. Weight: Unit: 41 oz, Rack: 11 oz. Size: 6.25 x 2 x 5.65. 14 volt; 28-volt with optional converter. TSOd to C129a, Class A-1. NOH GNC 300XL Americas North. P/N 11-02934. $3,295.00 *Please call for other database models.
GARMIN NOH GNC 300XL TSO IFR GPS/COM
The Garmin GPS 150XL features a Phase Trac 12 channel GPS receiver tracking 12 satellites simultaneously. Features include emergency search, 1000 user defined waypoints, 20 reversible routes, checklists, messages, true airspeed, winds aloft, 14 moving map scales, and a complete Jeppesen database showing US Class B and C airspace, all SUAs, MOAs, prohibited and restricted areas, and much more. Size: 6.25 x 5.8 x 2. Wt: 41 oz. Furnished complete with GPS antenna, Rack, and connectors. Call For Special Price! This unit is unrestricted for mail order. GPS-150XL Americas North..P/N 11-18950. $2,850.00 GPS-150XL International..P/N 11-18951. $2,850.00 Accessories for the GPS 155XL and 150XL Remote NiCad Batt/Chgr.P/N 11-18905. $298.50 Personal Computer Kit.P/N 11-18907. $99.00 User Data card.P/N 11-18908. $99.00 Non-TSOd so its priced really low. Yet, it includes an intercom and will support dual COMM, dual NAV, dual AUX receivers, and dual music audio inputs plus up to three unswitched inputs for telephone ringers, altitude alerts, or other warning tones. Pilots can connect up to two dedicated music sources to the rear connector (e.g. XM music and CD player) and over-ride one of those sources at any time by plugging-in a device (e.g. MP3 player) into the 2.5 mm front jack. The music sources volume can be increased or decreased with the GMA 240 by pulling out the copilot volume knob. The 2.5 mm front jack also makes it easy for pilots to make and receive cell phone calls. It has a full-duplex telephone interface with intercom isolation capability. Specifications: * Weight: 15.5 oz (440 g) * Dimensions: 1.3 x 6.29 x 7.12 * Power: Input voltage range: 11-33 Vdc, 4.3 W normal * Temperature range: -20C to +55C * Altitude: 55,000 MSL unpressurized * Transceiver inputs: 3 (including TEL) * Receiver inputs: 4 * Alert inputs: 3 * Input impedance: 500 Ohms * Input isolation: 60 dB min * Bandwidth: 100 Hz to 6.5 kHz * Music inputs (stereo): 2 * Music gain: -20 dB @ min. volume, +26 dB @ max. volume..P/N 11-06619..$795.00 The Garmin GMA 340 audio panel is compact and lightweight, making it an excellent choice for panels with limited space. Audio panel features include 3 transceiver inputs, 5 receiver inputs, and 2 unswitched inputs. The intercom provides 6 positions, 3 volume controls, 2 VOX level controls, 6 VOX circuits, and 2 stereo music imputs. This unit features 3 stereo headphone outputs and 2 speaker outputs, and the marker beacon receiver features input impedance of 50 ohms. Size: 6.8d x 6.29w x 1.3h. Power req.: 11-33 VDC GMA 340 Audio Panel. P/N 11-18960.$1,295.00 GMA 340 with basic harness.. P/N 11-08061.$1,354.00 GMA 340 with Harness (2 place). P/N 11-07172.$1,567.00 GMA 340 with Harness (4 place). P/N 11-07170.$1,875.00

The Garmin GMA 340 an GMA 240 can only be sold over the counter with the harness.

GARMIN GNC 150XL VFR GPS

GARMIN GMA 240 AUDIO PANEL
ANNUNCIATORS FOR GPS 155XL/GNC 300 (XL)
Model No. Description Part No, Price
MD41-444 Horizontal, 14V (with internal relay) 11-00967 $1,175.00 MD41-448 Horizontal, 28V (with internal relay) 11-00968 $879.00 MD41-454 MD41-458 Vertical, 14V (with internal relay) Vertical, 28V (with internal relay) 11-00969 $879.00 11-00970 $879.00
The GNC 250XL GPS/Comm features a PhaseTrac 12 GPS receiver tracking 12 satellites simultaneously. Features include emergency search, 1000 user defined waypoints, 20 reversible routes, checklists, messages, true airspeed, winds aloft, 14 moving map scales, and complete Jeppesen database showing US Class B and C airspace, all SUAs, MOAs, prohibited and restricted areas, and much more. Size: 6.25x 5.8x 2 Wt: 41oz. Furnished complete with GPS antenna, Rack, & connectors. Includes 760-channel 5W transceiver. Call For Special Price! GNC 250XL Americas North..P/N 11-18901. $3,525.00 GNC 250XL (Intl)..P/N 11-18902..$3,450.00 Accessories for the GNC 250XL & 300XL Remote NiCad Batt/Chgr..P/N 11-18905. $298.50 Personal Computer Kit.P/N 11-18907. $99.00 User Data card.P/N 11-18908. $99.to 14 VDC Converter.P/N 11-18909. $264.95
GARMIN GNC 250XL VFR GPS/COM
GARMIN GMA 340 AUDIO PANEL
Standard configuration includes: GPS 155XL receiver TSOd to C129a, Class A-1 with Jeppesen datacard, aviation installation kit including low profile TSO antenna, pilots guide & Quick Reference Guide. Features include: Panel mount with 12 parallel channel GPS receiver 80 x 240 super bright transflective DSTN display with moving map scaleable from 0.5 to 300 NM Accuracy to 15 meters Waypoint library holds up to 1,000 user-defined waypoints Jeppesen Americas Nav Data database Nearest search of 9 airports 11 to 33 volts Internal battery protects stored data up to 5 years Size: 6.25 x 2 x 5.65 Weight: Unit: 33 oz. Rack: 11 oz. GPS 155XL NOH Americas. P/N 11-05939. $2,968.00
GARMIN NOH GPS 155XL TSO IFR GPS
The GMA 347 audio panel builds upon the successful attributes of the GMA 340 while adding benefits such as automatic squelch, digital clearance recorder, and a full-duplex telephone interface. Automatic squelch option makes the entire audio experience quieter and clearer. Can also retain the manual squelch adjustment feature. Three more unmuted, unswitched inputs with individual volume control. Automatic digital clearance recorder. Continuously captures the last two and one half minutes of audio switched through the panel. Can replay the necessary information by simply pressing the play button. It has a fullduplex telephone interface with intercom isolation and disable capability. This feature allows private telephone calls by the pilot or copilot, or multiparty calls with crew and/or passengers. Integration of the G1000s configuration module. If the audio panel is ever removed, all of the pilots preferred settings are automatically loaded into the unit. Garmin GMA 347 Audio Panel..P/N 11-04314.$1,598.00 Garmin GMA 347 w/ harness 4PLC.P/N 11-07743.$2,293.00

The Garmin GMA 347 can only be sold over the counter to expermental aircraft (must verify) with harness. For certified aircraft, it must be installed by a Garmin Dealer. Please call 1-800-826-3160 for partner shop location for certified installs. (price of installation not included)
GARMIN GMA 347 AUDIO PANEL
The Garmin GNC 300XL and GPS 155XL requires an annunciator (MD 41 Series) abd CDI indicator (GI 102A) to operate.

AIRCRAFT SPRUCE WEST

CORONA, CA (877) 4-SPRUCE

AIRCRAFT SPRUCE EAST

PEACHTREE CITY, GA (877) 477-7823
Prices Subject to Change Without Notice

300xl manual

1/25/99 2:34 PM

Page i

P i l o t s

G u i d e

R e f e r e n c e

Page ii

This manual is written for software version 2.04 or above, and is not suitable for earlier software versions. 1999 GARMIN Corporation, 1200 East 151st Street, Olathe, Kansas 66062 USA Tel: 913-397-8200 Fax: 913-397-8282
GARMIN (Europe) LTD, Unit 5, The Quadrangle, Abbey Park, Romsey, Hampshire S051 9AQ, UK Tel: 011-44-1794-519944 Fax: 011-44-1794-519222 GARMIN (Asia) Corp., 4th Fl., No. 1, Lane 45, Pao-Hsing Road, Hsin Tien, Taiwan R.O. C. Tel: 011-886-02-2917-3773 Fax: 011-886-02-2917-1758

INTRODUCTION

Foreword
Web Site Address: www.garmin.com All rights reserved. No part of this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, for any purpose without the express written permission of GARMIN.
GARMIN, GNC 300XL, SpellNFind, AutoLocate, PhaseTrac12, GPSCOM and AutoStore are trademarks of GARMIN and may only be used with permission. NavData is a registered trademark of Jeppesen, Inc. All rights reserved.
Information in this document is subject to change without notice. GARMIN reserves the right to change or improve their products and to make changes in the content of this material without obligation to notify any person or organization of such changes or improvements.

January 1999

190-00067-30 Rev. B

Printed in USA

1/25/99 2:35 PM

Cautions

CAUTION
The Global Positioning System is operated by the United States government, which is solely responsible for its accuracy and maintenance. The system is subject to changes which could affect the accuracy and performance of all GPS equipment. Although the GARMIN GNC 300XL is a precision electronic NAVigation AID (NAVAID), any NAVAID can be misused or misinterpreted and therefore become unsafe. Use the GNC 300XL at your own risk. To reduce the risk of unsafe operation, carefully review and understand all aspects of this Owners Manual and the Flight Manual Supplement, and thoroughly practice using the simulator mode prior to actual use. When in actual use, carefully compare indications from the GNC 300XL to all available navigation sources, including the information from other NAVAIDS, visual sightings, charts, etc. For safety, always resolve any discrepancies before continuing navigation. The altitude calculated by the GNC 300XL is geometric height above mean sea level and could vary significantly from altitude displayed by pressure altimeters in aircraft. Never use GPS altitude for vertical navigation. The Jeppesen database incorporated in the GNC 300XL must be updated regularly in order to ensure that its information is current. Updates are released every 28 days. A database information packet is included in your GNC 300XL package. Pilots using an out-of-date database do so entirely at their own risk.
NOTE: This device complies with Part 15 of the FCC limits for Class B digital devices. This 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. Furthermore, there is no guarantee that interference will not occur in a particular installation. If this equipment does cause harmful interference, the user is encouraged to try to correct the interference by relocating the equipment or connecting the equipment to a different circuit than the affected equipment. Consult an authorized dealer or other qualified avionics technician for additional help if these remedies do not correct the problem. Operation of this device is subject to the following conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation. The GARMIN GNC 300XL does not contain any user-serviceable parts. Repairs should only be made by an authorized GARMIN service center. Unauthorized repairs or modifications could void your warranty and authority to operate this device under Part 15 regulations.

To acknowledge the database information: 1. Press the E key.

TAKEOFF TOUR

Power On
The welcome page appears when the GNC 300XL is turned on. During the time this screen is displayed, the GNC 300XL performs a self test to ensure proper operation.
The database confirmation page shows the effective and expiration dates of the Jeppesen database on the NavData Card.

Page 2

Acquiring Satellites
Once the database has been acknowledged, the satellite status page will appear, and the GNC 300XL will begin to collect satellite information. An Acquiring status will be displayed on the satellite status page, and the signal values on the bottom line of the page will begin displaying numeric values. This is a good indication that you are receiving signals and satellite lock will occur. Following the first-time use of your GNC 300XL, the time required for a position fix will vary usually from one to two minutes. If the unit can only obtain enough satellites for 2D navigation (no altitude), the unit will use the altitude provided by your altitude encoder (if one is connected and working). If not, you will be prompted to enter the altitude with a Need alt- Press NAV message. If this message occurs, press the N key and use the K and O knobs to enter the altitude shown on your altimeter. Press E when finished.
The satellite status page shows the ID numbers for the satellites and the relative signal strength of each satellite received. Turn the K knob to view additional satellites.
If the GNC 300XL has not been operated for a period of six months or more, it may have to Search the Sky to collect new data. This means the unit is acquiring satellite data to establish almanac and satellite orbit information, which can take 5 to 10 minutes. The satellite status page will display a Search Sky status, and the message annunciator (U), next to the M key, will also flash to alert you of a system message Searching the Sky.
To view a system message: 1. Press M.
The message page will appear and display the status or warning information applicable to the receivers current operating condition.
Search Sky indicates that satellite almanac data is not available or has expired (if the unit hasnt been used for six months or more). The data will be recollected from the first available satellite.
To return to the previous page after viewing a message: 1. Press M again.

Page 3

While the GNC 300XL is acquiring a position, lets take a minute to dial in the active and standby frequencies youll be using for the first phase of your flight. The GNC 300XLs display can be broken down into two separate windows (or screen areas), the comm window (the top line of the display) and the GPS window (the bottom three lines of the display).

Comm Frequencies

CDI page with trk and eta displayed.

Map Display

Data Fields
CDI page with brg and trk displayed.
The communication frequencies are located in the upper left corner of the page, instead of across the top line as on other pages. The top frequency is the active frequency, with the standby frequency directly below.

Page 7

Airspace Boundaries Airport Waypoint Present Position

Map Page

The map display occupies the right side of the display. Your present position is indicated by a plane symbol (in track up mode) or a position diamond (in other orientation modes), with your route displayed as a solid line. Nearby airports, navaids and user waypoints may be depicted on the map; with unique identifying symbols for each waypoint type. Boundaries for special use and controlled airspaces can also appear on the map display. You may select which features are shown on the map using the map setup page (see page 101).
Distance to Waypoint Ground Speed Track Map Scale
The map display may be oriented along your ground track (track up), course (desired track up) or fixed at north up. Desired track up or north up settings show your present position with a diamond symbol instead of the airplane symbol.

Destination Waypoint

Desired Track
The data fields on the map page indicate distance to destination waypoint, desired track, ground track, ground speed and map scale. The destination waypoint name and desired track appear on the left side of the page, below the communication frequencies. The other data fields are located at the corners of the map display as shown in the illustration above, and may be removed by pressing \.
Communication frequencies are shown in the top left corner of the map page, instead of across the top line as shown on other GNC 300XL screens.

Page 8

Map Scales NAVCOM Page
The map display has 14 available ranges from 0.5 to 300 (nautical miles, statute miles or kilometers) representing the vertical height of the map. The map scale is controlled by the inner knob (K), with the current scale displayed in the lower right corner of the page.
To select a map scale: 1. Rotate the K knob clockwise to increase the map scale and show a larger area. 2. Rotate the K knob counterclockwise to decrease the map scale and show a smaller area.
To change the map scale rotate the K knob clockwise to increase the scale or counterclockwise to decrease the scale.
Another page available under the GNC 300XLs N key is the navigation communications (NAVCOM) page. It provides you with a complete list of airport frequencies at your departure and arrival airports, allowing convenient selection of frequencies youll need along your flight path. If you do not have an active departure airport, the navigation communications page will display the frequencies for the airport nearest your departure position.

CDI page Map page NAVCOM page

NAV KEY

Overview

SECTION

NAV Menu 2

Position page

NAV Menu 1

Satellite status page

The CDI, map, NAVCOM and position pages are the primary pages used during in-flight navigation, while the nav menu and status pages offer access to planning, calculation and status functions. Note that rotating the outer knob clockwise will continuously cycle through all the navigation pages, whereas turning the knob counterclockwise will stop the page selection sequence at the CDI page. Whenever the N key pages are in use, the indicator light (U) next to the N key will illuminate. If the GNC 300XL requires you to enter data on a navigation page, a message prompt with specific instructions will appear and the indicator will flash. If you leave the NAV page sequence for another set of pages, the last NAV page displayed will reappear when you return to the nav sequence.
Remember! The NAV pages will only display information AFTER the position and navigational information has been calculated from the satellites. If you are on the position page before the unit has calculated a position, you will be able to enter an approximate position and altitude. This is helpful in speeding satellite acquisition if the unit has moved a great distance with the power off. If you are not sure the GPS is actively calculating position, check the receiver status field for 2D NAV or 3D NAV by pressing the N key and rotating the outer knob until the satellite status page appears. The current receiver status is displayed at the top left of the page.

Page 12

CDI Page
The GNC 300XLs CDI page provides you with the important information needed to navigate directly to your destination. The destination field, located at the bottom left of the page, displays the current destination waypoint or active route leg being navigated. If no direct-to destination, route or approach is being navigated, the destination field will remain blank.
Ground Speed Messages or CDI Direction Field

Distance Field

The TO/FROM arrow indicates whether you are heading to (an up arrow) the waypoint or if youve passed the waypoint (a down arrow).

Active Waypoint

Time or Direction Field
The graphical CDI (course deviation indicator) at the top left of the page shows your position relative to the desired course (the moving D-bar) to the destination waypoint. The TO/FROM arrow in the center of the scale indicates whether you are heading to (an up arrow) the waypoint or if you have passed the waypoint (a down arrow). Note that the GNC 300XL always navigates TO a waypoint unless the GPS SEQ switch is set to the HOLD position, or you have passed the last waypoint in a route. The default setting of the CDI scale is auto. If you are not navigating to a destination, the CDI field will display a no actv wpt message, and only speed and track data will be available. The CDI field is also used to display the GNC 300XLs turn anticipation and waypoint alert data during route operations (see Section 5). In addition to displaying your active destination and the course deviation scale, the CDI page features four selectable fields for various distance, direction and time options. This allows you to configure the CDI page to your preferences. The default settings are ground speed, distance, desired track and estimated time en route.

Satellite status page with DOP displayed. Dilution of Precision (DOP) measures relative accuracy from 1 to 10.
Acquiring satellites for navigation. In this case, the satellites are being received, but the data is still being collected before a position can be determined.

Page 22

Receiver Status & Satellite Data
Poor Cvrge- The GNC 300XL cannot acquire sufficient satellites for navigation. Need Alt - The GNC 300XL needs altitude in order to start/continue navigation. Press N to display the position page and enter the altitude. Not Usable - The GNC 300XL is unusable due to incorrect initialization or abnormal satellite conditions. Turn the unit off and on again. Autolocate - The GNC 300XL is looking for any satellite whose almanac has been collected. This process can take up to five minutes. The third and fourth lines of the satellite status page provide the satellite number and signal strength of each satellite in view. The satellite status page shows signal strength for up to eight satellites at a time. If additional satellites are being received an arrow on the sat line will indicate additional data is available.
Searching the Sky for satellites. No satellite almanac data exists in the GNC 300XL. It must be recollected from the first available satellite.
To view additional satellites: 1. Rotate K to view more satellites.
Additional information regarding each satellites azimuth, elevation and other data is also available.
To view individual satellite information: 1. Press N and use O to display the satellite status page. 2. Press C twice to activate the cursor in the GPS window. 3. Use O to highlight the satellite number you wish to view and press E. This will display the satellite data page, showing the selected satellites number, elevation angle, rise or fall indication, User Range Accuracy (URA, or the range measurement accuracy as determined by the satellite), azimuth and signal strength. 4. Rotate K to view information for the next satellite. 22 5. Rotate O and press C on the satellite status page when you are finished.
Viewing individual satellite information.

Page 23

In addition to the other five pages, the GNC 300XL features two menu pages to perform a host of planning and navigation functions. NAV Menu 1 provides access to the following functions: Trip Planning Density altitude/true airspeed calc. Fuel Planning Winds aloft calculations VNAV Planning Checklists
To display NAV Menu 1: 1. Press N. 2. Rotate O until NAV Menu 1 is displayed.

NAV Menu 1 Trip Planning

Fuel planning page showing calculation from present position to KDAL.

Page 25

To perform fuel planning operations: 1. Press N and rotate O until NAV Menu 1 is displayed. 2. Press C twice and rotate O until Fuel Plan? is highlighted. Press E. 3. Rotate K to select either wpt for direct navigation or the desired route number. Press E. 4. For waypoint-waypoint navigation, use K and O to enter the to and from waypoints. Press E to accept the waypoints. To use the present position as a waypoint, leave the corresponding waypoint field blank. 5. For route calculations, choose either cum for cumulative route fuel requirements (from beginning to end) or the leg desired by rotating K.

NAV Menu 1 Fuel Planning

If leg is selected, it displays the amount of fuel required to fly until that leg is complete. For example: The fuel required to complete leg 2 is leg 1 + leg 2. Fuel required to complete leg 4 is leg 1 + leg 2 + leg 3 + leg 4.
6. Rotate O to advance the cursor to fob: or gs: (depending on which is displayed). 7. Use K and O to enter the fuel on board or the ground speed. Press E. 8. Rotate O back two positions to highlight the fob: or gs: field again. 9. Rotate K to display the other information. Press E. 10. Use K and O to enter the remaining data. Press E. 11. Use K and O to enter the flow rate, in units per hour, if needed. Press E.
Fuel planning page showing calculations between two waypoints.
The GNC 300XL will calculate the range and endurance (i.e., how long the fuel will last) of your aircraft. These are found in the first field on the bottom row of the page. The amount of fuel left on board (lfob) and reserve time after the selected direct-to, leg or route is flown are displayed in the second field on the bottom row.
Fuel planning page with other information indicating endurance and reserve times.

Page 26

Winds Aloft & VNAV Functions
The GNC 300XLs winds aloft function is used to calculate the true direction and speed of any winds, and indicates whether you are flying with a head wind or tail wind, and the wind speed.
To calculate winds aloft: 1. Press N and rotate O until NAV Menu 1 is displayed. 2. Press C twice and rotate O until Winds? is highlighted. Press E. 3. Use K and O to enter your present heading in the hdg: field. If your installation includes a fuel/air data computer, this will be displayed automatically. Press E. 4. Use K and O to enter your true airspeed (TAS) in the tas: field. If you have previously calculated it using the density altitude/true air speed function, it will be displayed as the default. Press E. The wind direction and speed and head/tail wind will be displayed.

Page 33

Section 2 Communicating with the GNC 300XL
The GNC 300XL features a digital VHF radio that provides a seamless transition from communication to navigation, bringing the two most important functions in flying together in one panel-mount unit. The GNC 300XL operates in the aviation voice band, from 118.000 to 136.975 MHz, in 25 kHz steps. Communication frequencies are selected by activating the cursor in the standby frequency field and using the inner and outer knobs to dial in the desired frequency. A frequency may also be quickly selected from the navigation database by simply highlighting the frequency and pressing the E key. Once a desired frequency is displayed in the standby field, it may be made the active frequency by pressing the @ key. Note that the active frequency may not by accessed directly. Whenever the cursor is active in the comm window, the standby frequency will be highlighted.
To access the standby frequency, press C.

COMM FEATURES

CDI page with cursor inactive.
This allows you to change the megahertz (number to the left of the decimal) by rotating O and the kilohertz (number to the right of the decimal) by rotating K. If you would like to keep the standby field hot (ready for an immediate frequency change), leave the cursor active in the comm window. To remove the cursor, press C twice after you have selected the desired frequency.
To make the standby frequency the active frequency, press @.
The frequencies will be flip-flopped and youll be able to transmit and receive on the frequency previously entered as standby. This can be done at any time, regardless of cursor or GPS status.
CDI page with standby field active. To flip-flop the frequencies, press @.

Page 34

Overview Auto-Tuning
During the course of navigating with the GNC 300XL, there may be times when you need to quickly select a comm frequency while you are entering data in the GPS window. Whenever data entry in the GPS window is interrupted by activating the standby frequency field, the GPS field in use will become splatted, or blocked out.
Once the standby frequency has been entered, you may return to data entry by pressing the C key. The cursor will return to the active GPS field at the point where data entry was interrupted.

To auto-tune from the nearest airport page, press E.
The GNC 300XLs auto-tune feature allows you to quickly select any database frequency in the GPS window as your standby frequency.
To auto-tune a single frequency displayed in the GPS window: 1. Press E with the cursor inactive. 2. To make the standby frequency the active frequency, press @. To auto-tune a frequency from a list displayed in the GPS window: 1. Press C twice to activate the cursor in the GPS window. 2. Rotate O to highlight the desired frequency.
To select a frequency from a list, highlight the desired frequency and press E.
3. Press E to make the selected frequency the standby frequency.
Another useful feature integrating the GNC 300XLs navigation and communication capabilities is the Navigation Communications (NAVCOM) page, which is accessed using the N key. See pages 17-18 for more on the NAVCOM page.

Page 35

The GNC 300XLs automatic squelch and volume controls are located at the bottom left of the unit, near the NavData card slot.
To adjust the radio volume: 1. Rotate the B knob.
Squelch & Volume Emergency Channel
Whenever the GNC 300XL is powered up, the automatic squelch will be in the on position, allowing only transmissions which are powerful enough for clear broadcast to be received. Manual squelch control is not available.
To override the automatic squelch control: 1. Press the Q key. Press Q again to return to automatic squelch.
Whenever the GNC 300XL is transmitting, a tx icon will appear between the active and standby frequency fields. If the microphone is stuck or accidentally left in the keyed position, or if the headsets continue to transmit after the key is released, the radio will automatically timeout after 35 seconds of continuous broadcasting. Youll also receive a Stuck mic/Tx disabled message as long as the stuck condition exists. The GNC 300XLs emergency channel select feature provides a quick method of selecting the 121.5 MHz frequency as the active frequency in the event of an in-flight emergency. The emergency channel select is available whenever the unit is on, regardless of GPS or cursor status, or loss of the display.
To automatically tune for emergency transmission: 1. Press and hold the @ key for more than two seconds.
TX indicating radio transmission.
The emergency channel (121.50) will appear in the active field by pressing @ for more than two seconds.

Page 36

WPT KEY
Section 3 Waypoint and Database Information
The GNC 300XL uses a Jeppesen NavData card to provide position and facility information for thousands of airports, VORs, NDBs and intersections. Each facility in the database is stored as a waypoint with its own latitude/longitude, identifier (up to five letters and/or numbers), and other pertinent information. Up to 1,000 user waypoints may also be created and stored in the GNC 300XLs internal memory.

Active route page with leg distance and estimated time en route displayed.

Page 76

On-Route Direct-To
To delete a waypoint from the active route: 1. Press C twice, if necessary, to activate the cursor. 2. Use O to highlight the waypoint you would like to delete from the active route. 3. Press \, followed by E. The next route waypoint (if available) will move up to take the position of the deleted waypoint.
You can hold on a destination waypoint by setting the GPS SEQ switch to the HOLD position. The GNC 300XL will hold on the current active to waypoint as your navigation reference and prevents the unit from sequencing to the next waypoint in the route. A user-defined course may also be selected on the external HSI (OBS).
The active route page also allows you to select your next destination waypoint manually from the active route waypoint list and resume the remainder of the route in sequence. This procedure, referred to as an on-route direct-to, allows the pilot to fly directly to any waypoint in the active route without editing the active route, approach, SID or STAR itself. For example, if you are flying a route with an armed approach, the GNC 300XL will automatically provide the initial approach fix (IAF) for the selected approach as your active to waypoint. If you have been vectored directly to the final approach fix (bypassing the IAF), you can manually skip ahead to the final approach fix as your next active to waypoint.
To perform an on-route direct-to from the active route page: 1. Press C twice and rotate O to highlight the desired waypoint. 2. Press D, followed by E to confirm the ok? prompt on the waypoint confirmation page.
Whenever waypoint sequencing is set to hold, the desired course is displayed at the bottom left of the CDI page. See page 64 for more details.
The GNC 300XL will now provide guidance to the selected waypoint and resume navigating the remainder of the route in sequence once you arrive at the next destination waypoint. The waypoint sequencing field, located at the bottom left of the direct-to confirmation page, indicates the current status of the waypoint sequencing (GPS SEQ) switch. For more information on the waypoint sequencing switch and waypoint hold operations, see Section 6.

Page 79

The GNC 300XL works in conjunction with a set of external switches and your HSI (OBS) to fly GPS approaches. The external switches are used to control GPS functions, and contain illuminated annunciators to indicate when functions are active. Your installation must also have annunciators for waypoint arrival and GPS messages.
GPS APR Switch Auto Arming

NAV GPS NAV ACTV

NAV GPS ARM GPS
The NAV/GPS switch determines which data (GPS or NAV1) will be displayed on the HSI and used by the autopilot/flight director. The current selection will be indicated by an annunciator light. If power to the GNC 300XL is lost, the system will automatically revert to NAV1.
Arm Approach Mode The external GPS APR switch will automatically be set to the ARM position 30 nm from the destination airport. Once the approach is armed, the unit will provide a smooth transition from the 5.0 to 1.0 nautical mile CDI scale, and down to 0.3 nm within 2 nm inbound to the FAF. If the approach is manually disarmed, it may be re-armed at any time (before reaching the FAF) by pressing the GPS APR switch.

GPS APR CTV

GPS APR ARM ACTV
The GPS APR switch is used to arm or deactivate an approach, and indicates the current approach phase status (ARM or ACTV). The GNC 300XL will automatically arm a selected approach 30 nm from the airport. If the pilot wishes to terminate the approach or fly the missed approach, the GPS APR switch may be pressed to disarm/deactivate the approach at any time and return the CDI scale sensitivity to the 1.0 nm setting. The GPS APR switch may also be used to re-arm the approach at any time before reaching the FAF. If the selected approach is disarmed before the FAF, the unit will prompt you to re-arm the approach 3 nm before the final approach fix.

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GPS SEQ Switch

AUTO ACTV

The GPS SEQ switch is used to select manual or automatic waypoint sequencing of waypoints. Setting the GPS SEQ switch to the HOLD position holds your current active to waypoint as your navigation reference and prevents the GPS from sequencing to the next waypoint. When the GPS SEQ switch is set to the AUTO position, automatic waypoint sequencing is selected. Whenever the GPS SEQ switch is engaged, the HOLD annunciator will illuminate and the GPS will continue navigating to the active-to waypoint regardless of your position relative to other waypoints.
The GPS SEQ switch must be set to the HOLD position any time you are deviating from the flight sequence of an approach (e.g., when you are flying radar vectors) or when you must cross the same waypoint twice in succession (e.g., procedure turn, IAF and FAF at the same waypoint). Whenever the GPS SEQ switch is set to the HOLD position, the GNC 300XL allows you to select the desired course to/from a waypoint using the HSI, much like a VOR. Whenever the GPS SEQ switch is released from the HOLD position, the GNC 300XL will capture the present HSI setting as your desired course. Always dial in your next desired course before returning the GPS SEQ switch to the AUTO position. The GPS SEQ switch may be released from the HOLD position 2 seconds after the inbound course has been set. The GNC 300XL will continue navigation on the last selected course through the active-to waypoint and sequence to the next approach waypoint.

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To set the minimum runway length and runway surface: 1. Press and hold M and use O to display the Nearest apt search page. 2. Press C twice and use K and O to enter the minimum runway length upon which your aircraft can land (up to 9999 units). Press E to accept the distance. 3. Rotate K to display the surface selection you desire. Choices include: any surface soft/hard surface hard only surface water only surface
Nearest Airports Battery Saver
4. Use O to select ok? and press E to confirm.
The GNC 300XLs battery saver feature can be programmed to automatically turn off the backlighting when using the optional remote battery pack. This will increase the remote battery life in the event of power failure. During this time, the GNC 300XL will continue to navigate and track satellites, but will not backlight the display until a key is pressed or a knob is turned.
To set the display timeout: 1. Press and hold M and rotate O to display the Battery saver page. 2. Press C twice to activate the cursor. 3. Rotate K until the desired value is displayed (0, 30, 60 or 90 seconds). Entering 0 will leave the display on at all times. Press C to finish.
Display timeout settings. As shown, the display backlight will turn off after 30 seconds to conserve power in the optional battery pack.
The GNC 300XL features automatic contrast and backlighting control to adjust the display for optimum viewing in any condition. This is done using a photocell at the top left corner of the display bezel. It is important that this photocell not be covered to ensure proper display adjustment. You may also select manual control of the display contrast and backlighting to tailor the GNC 300XL to your needs.

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To change the display contrast settings:

Display Settings

1. Press and hold M and rotate O to show the Display settings page. 2. Press C twice and use K to select auto or manual control. 3. Press E. 4. If manual is selected, use K to set the display contrast level. (If auto is selected you may also change the offset level to your preference.) 5. Press C to complete.
The mode selection allows you to display on-screen characters as black on a light green background (positive) or light green on a black background (negative). With the auto setting the photocell selects the best mode for day or night viewing.
The display contrast may be set to automatically adjust to varying lighting conditions, using the built-in photocell.
To change the display mode settings: 1. Press and hold M, and rotate O to show the Display settings page. 2. Press C twice and use O to highlight the mode field. 3. Rotate K to select pstv, ngtv or auto. 4. If auto is selected, rotate O to highlight the threshold level, and use K to select the level at which the display will switch from positive to negative for night time use. (Note: Some experimentation may be necessary to obtain the desired response level.)

Do not use for nav EEPROM write fail

Final altitude alert

Fuel/Air input fail

Heading input fail

Inside SUA
a certified technician. - The GNC 300XL has detected a problem with the data card. The data is not usable and the card should be returned to Jeppesen or an authorized GARMIN service center. - The user data card failed to program. The card should be returned to an authorized GARMIN service center. - The GNC 300XL has detected poor satellite geometry while RAIM is not available. Additional cross-checking with a secondary navigation source should be performed to verify the integrity of the GPS position. - The GNC 300XL is in the simulator mode and must not be used for actual navigation. - The GNC 300XL has detected a failure while programming its installation configuration memory. The unit is not usable and should be taken to an authorized service center. - The suggested altitude is within 1000 feet of the final altitude entered on the VNAV planning page. - The fuel and/or air data input is not available to the GNC 300XL. Check the I/O settings and the fuel/air system installation. - The heading input from ARINC 429 is not available to the GNC 300XL. Check the I/O settings and/or have the installation checked by a certified technician. - You have entered a Special Use Airspace.

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Invald CPA wpt _____

Invalid copy route

Invalid CPA route Invalid SAR route Leg not smoothed

Memory battery low

Near SUA < 2 nm Need alt - press NAV
- The closest point of approach cannot be created from the waypoint entered on the CPA Page. This occurs when the computed point does not fall on one of the route legs, or when a unique waypoint name for the closest point of approach cannot be found. - A non-empty route was selected for a copy operation. A route must be empty before another route can be copied to it. - The selected route contains less than two waypoints and cannot be used for CPA operations. - The selected route does not contain exactly two waypoints and cannot be used for SAR operations. - The upcoming leg is too short for smooth waypoint transitions. Expect a rapid change in the CDI. - The battery that sustains user memory is low and should be replaced by an authorized GARMIN service center as soon as possible. Failure to do so may result in loss of stored data, including all user waypoints and routes. - Your position is within 2 nm of an SUA, and your current course will not take you inside. - The GNC 300XL needs altitude input in order to start and/or continue 2D navigation. Press the NAV key and enter your antenna altitude on the position page. The altitude you enter should be as accurate as possible. An inaccurate altitude will directly translate into inaccurate position information.

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What does the GPS APR switch do? What is arming an approach? The GPS APR switch must be set to the ARM position for an approach to enter the active phase. It may be left in the ARM position to simplify approach operation. Its main function is to provide the pilot with a quick method of deactivating the approach and returning the CDI scale to the 1 nm scale in the event of a missed approach. For more on the GPS APR switch and arming approaches, see pages 78-79. What does the GPS SEQ switch do and when do I use it? The GPS SEQ switch is used to select manual or automatic waypoint sequencing of waypoints. Setting the GPS SEQ switch to the HOLD position holds your current active to waypoint as your navigation reference and prevents the GPS from sequencing to the next waypoint. When the GPS SEQ switch is set to the AUTO position, automatic waypoint sequencing is selected, and the GPS will automatically select the next waypoint in the route once the aircraft has crossed the present active-to waypoint.
AUTO Automatic sequencing of waypoints Change in HSI does not affect CDI deflection Always navigates TO the active waypoint Must be set to AUTO for approach to go active HOLD Manual sequencing- HOLDs on selected waypoint Manually select course to next waypoint from HSI Will indicate TO or FROM waypoint Approach will not go active
The GPS SEQ switch must be set to the HOLD position any time you are deviating from the flight sequence of an approach (e.g., when you are flying radar vectors) or when you must cross the same waypoint twice in succession (e.g., a procedure turn or holding pattern). Whenever the GPS SEQ switch is set to the HOLD position, the GNC 300XL allows you to select the desired course to/from a waypoint using the HSI, much like a VOR, and display a to/from flag for the active-to waypoint. In the AUTO position, the CDI will always display a TO indication for the next waypoint once youve crossed the active waypoint. Refer to page 92 for an approach example using a HOLD.