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Part #:

Model: GTN-635




WAAS GPS/Comm - Touchscreen

Part Number :

GTN 635
  • Touchscreen WAAS GPS/COMM (does NOT include NAV) with Multifunction Display capabilities
  • Menu-driven graphical interface on color LCD touchscreen display
  • 4.9" diagonal high-resolution TFT display
  • On screen alphanumeric entry options
  • Designed with raised grips in the bezel and a shelf across the lower edge that serve as gripping points during flight conditions
  • Feature-rich MFD capabilities: moving map, airways, approaches & more
  • High resolution terrain mapping - including topography features, cities, airports, terminal areas,
    SUAs and more
  • GPS TSO'd to C146c, authorized for Class 1, 2, 3 (LPV)
  • GPS WAAS-certified to Gamma-3 approach capability
  • WAAS-corrected GPS signal accuracy to 1 M RMS
  • Graphical flight planning (including airway navigation)
  • Edit your entire route on the map screen and easily enter new or modify existing waypoints
  • VHF COMM transceiver: 8.33 or 25 kHz channel spacing
  • Recent & favorite user frequencies are easily accessed
  • Holding down the volume knob will automatically dial in the emergency frequency
  • Com transmit power: 10W standard, 16W optional 
  • Extensive optional interface capabilities: lightning, weather, traffic, TAWS-B terrain alerting, and more
  • Integrated control/display for remote transponder
  • Flight control system interface for select autopilots
  • Optional XM WX satellite weather and XM Radio
  • SafeTaxi airport diagrams
  • OPTIONAL - coupled with GDL-69 series datalink receiver - overlay NEXRAD radar right onto your moving map display and receive satellite music
  • Features a front-loading SD card reader - easily update your databases
  • The 16 Watt COM Enablement Card, Garmin P/N 010-00878-04, is to be used on 28 VDC aircraft only

OPTIONAL Class A TAWS, ADS-B Out software upgrade available at additional cost, P/N: 010-00878-05

Dimensions:  6.25"W x 2.65"H x 11.25"D Display Size: 4.46"W x 1.98"H
Display Resolution: 600 x 266 pixels Display Type: Color TFT LCD; sunlight readable
Weight: 6.2 lb Voltage Range:  11-33
Built-in VHF Comm: Yes Transmit Power: 10 watts min, 16 wast min(optional)
Built-in VOR/LOC/GS: No Receiver: 15 channel; TSO-C146c


Basemap: Yes
US Terrain & Obstacle Database: Yes Nav Database: Yes
Types of Jeppesen Data: Full & Non-Precision approaches, DPs and STARs, Victor/Jet Airways Nav Database Coverage Area: Americas, International or Worldwide
1000 Flight Plans: 99 reversible; up to 100 waypoints each
Fly WAAS Approaches: Yes Moving Map: Yes
Front-Loading Datacards: Yes XM WX Weather & Radio for US &
Canada Compatible:
TIS Alerting Compatible: Yes Class B TAWs Alerting Compatible: Yes
Additional: Eligible for PilotPak Databases    
Part Number Audio Panel Description:
010-00812-50 Black receiver w/rack, backplate, conn kit, config module & product info kit
011-02255-00 Black receiver, 11-33 VDC 



NSN: 5826-01-669-1901

Price Condition Status
- WAAS GPS/Comm - Touchscreen
Price Condition Status
- Helicopter GTN 635 Black
Price Condition Status

Click on a question below to see the answer. If you have a question about this model that is not answered below, please contact

Newly Overhauled parts obtained from Garmin are designated with an N in their part number. This usually follows the 010- in the part number. As with most Garmin 010 part numbers, the N part numbers are for ordering purposes only and do not actually appear on the dataplate of the unit.

The error message can result from a wide variety of issues. Below is a list of the most common issues:

  • The SD card may be write protected. When write protected, data cannot be written to the SD  card. On the SD card there is a small locking mechanism that can slide up and down. To be unlocked, the locking tab should be closer to the metal contacts on the SD card. Furthermore, the process of inserting the SD  card into your Garmin device and/or SD card programmer may move the locking tab out of place.
  • The card programmer cannot read or write to a high capacity card. Some card programmers cannot handle high capacity SD cards without a software download or driver update.
  • There is an error or bad data region on the SD card. Perform an error checking scan of the card through Windows to correct the errors.


The glide path that is generated is based on the information that is used for the Localizer Performance with Vertical guidance (LPV) and Lateral Navigation / Vertical Navigation (LNAV/VNAV) procedures. It uses a specified decent angle that is centered at the MAWP (Missed Approach Waypoint) and at the TCH (Threshold Crossing Height). If this information is included in the electronic database for the approach, the 400W/500W series, G1000 with WAAS, and GTN 600/700 series will generate a glide slope.



Error "0" is associated with the database program running on a computer that is not running a supported operating system. For the program to work correctly, the file must be downloaded on a computer running Windows XP or newer.


The serial number on the product is necessary for registration and warranty purposes. The system ID is an internal number which is required for database updates and downloads. These updates can be completed at Each aviation database update is downloaded specific to the system ID of each GPS, therefore if the system ID  is incorrect on our website, your aviation databases will not update correctly.


The system ID is required for aviation database updates which are downloaded from The database updates download specific to the system ID of each GTN so it is important this number is correct.

Follow the steps below to locate the system ID, from the 'Home' screen on the GTN:

  1. Touch the 'System' icon
  2. Select 'System Status'
  3. At the top of the 'System Status' page, the 'System ID ' is the second number listed

Once this number is copied correctly, log on to the FlyGarmin website and add the appropriate GTN to an aircraft on the account. Once the GTN  is added, databases will be available for purchase and then ready for download.




To update your GTN-635 with current databases log in to our website On the flyGarmin website, find the tabs along the top of the screen and follow the steps below:

1. Click the "Aircraft" tab
2. Click "Add an Aircraft" from the right hand side of the page.
3. Fill out all required information: Make, Model, Series, Tail number, Year, Serial Number
4. Click "Add Aircraft"
5. Click on "Add a new aircraft device" under What can I do?
6. Select the make and model of Garmin equipment
7. Enter the System ID or Serial number
8. Click on any of the database names to the left of the picture of your equipment
9. Click the "Buy Databases" button
10. Click "Buy" again
11. Click the "Download Now" button once the database has been purchased
12. On the flyGarmin website, click the "INSTALL" button. The website will automatically start to update your unit.


To view a list of frequencies which have recently been in the "Active" Communications Frequency box on the GTN, follow the steps below:

  1. Select the "STBY"  or Standby Communications Frequency box
  2. On the next screen, touch the "Find"  icon
  3. A list of "Recent Communication Frequencies" will appear
  4. If it is necessary to utilize one of the frequencies, touching the appropriate frequency will automatically place it in the "STBY" communication box

If a particular frequency is used often, it may be helpful to take advantage of the recent communications feature to call-up the appropriate frequency.

In relation to NE (New) parts, many OEMs change their prices and availability without any notice to dealers or the industry. Therefore, through the REQUEST or RFQ indication, we ask that customers contact us for the most accurate price and availability.

In relation to SV & OH parts, the used parts aftermarket in the aviation industry is not an infinite supply. It is a dynamic, constantly changing market that is significantly affected by and susceptible to highs and lows in supply and demand. Therefore, although we attempt to, at times, we are unable to predict the exact moment when an item may be available. Once again, through the REQUEST or RFQ indication on our website, we ask that customers contact us for the most current and accurate price and availability.