Garmin GPS 400W,GNC 420W User Manual (English)

Other manuals for Garmin GPS 400W,GNC 420W

Questions and Answers:

B
beardlouisAug 30, 2025
How to fix Garmin ARINC 429 device that is not receiving data from the 400W Series unit?
- M
  Marcus ThompsonAug 30, 2025
  If an ARINC 429 device isn't receiving data from the 400W Series unit, check the following: * 400W Series unit ARINC 429 output configuration: Check the ARINC 429 output port setting for the port that the device is connected to. * ARINC 429 input port speed: Check the ARINC 429 input port speed setting for the port that the device is connected to and verify that the speed is correct for that device. * Wiring: Check wiring.
M
Mary Miller DDSAug 31, 2025
What causes Garmin tuning data not updating DME and how to solve it?
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  Matthew CookAug 31, 2025
  If the tuning data isn't updating the DME, it could be due to: * Incorrect configuration: Check the DME Channel Mode on the VOR/LOC/GS CDI page. * Wiring: Check wiring.
J
Jasmine AndersonAug 31, 2025
What does Garmin basemap database integrity error mean and how to fix it?
- R
  Rachel LeonAug 31, 2025
  A “Basemap database integrity error” message on your 400W Series unit indicates a failure in the built-in basemap (land data) database. To resolve this, reload the basemap database.
D
Debra HughesAug 31, 2025
Why Garmin 400W Series GPS unit is not receiving heading from compass system?
- J
  John MitchellSep 1, 2025
  If your 400W Series unit isn't receiving heading from the compass system (when using ARINC 429 heading input), it might be due to: * Incorrect ARINC 429 input port speed: Check the ARINC 429 input port speed setting for the port that the device is connected to and verify that the speed is correct for that device. * Wiring: Check wiring.
L
Laura SmallSep 1, 2025
How to resolve Garmin data transfer cancelled (version mismatch) error?
- B
  Brian WiseSep 1, 2025
  A “Data transfer cancelled (version mismatch)” error during a unit-to-unit crossfill indicates that the database versions on the two 400W Series units aren't identical. Update the databases so they match.
A
aallenSep 1, 2025
How to fix Garmin CDI scaling on EFS 40/50 that is not correct?
- D
  Daniel Sims MDSep 1, 2025
  If the CDI scaling on your EFS 40/50 is incorrect, it may be because the FMS #1/#2 configuration is not set to “KLN 90-GPS”. Reconfigure EFS 40/50 for “KLN 90-GPS” on FMS #1/#2 inputs, as appropriate.
C
Colin ParkerSep 2, 2025
What to do if Garmin data transfer cancelled (data invalid)?
- B
  brenda13Sep 2, 2025
  A “Data transfer cancelled (data invalid)” error during a unit-to-unit crossfill means that an attempt to transfer a single user waypoint was cancelled because no waypoint was specified on the Crossfill Page. Select a user waypoint and re-attempt the transfer.
K
Kyle RamirezSep 2, 2025
What causes Garmin RMI pointer to not indicate correctly?
- A
  alicia29Sep 2, 2025
  If the RMI pointer isn't indicating correctly, the desired RMI source might not be selected. Check the OBI source selection on the Main CDI/OBS Config page.
C
Catherine MercadoSep 3, 2025
How to resolve Garmin user card format unknown error?
- Y
  Yvette ThompsonSep 3, 2025
  If your device displays a “User card format unknown” error, it means a data card has been inserted, but the format of the card isn't recognized. Try reloading the information onto the card; if that doesn't solve the problem, replace the card.

Garmin GPS 400W,GNC 420W Specifications

General

Display	5.0" diagonal, 256 colors TFT
Resolution	320 x 234 pixels
WAAS	Yes
Operating Temperature	-20°C to +55°C
Update Rate	1 Hz
Database	Jeppesen
COM Frequency Range	118.000 to 136.975 MHz
COM Channel Spacing	25 kHz
NAV Frequency Range	108.00 - 117.95 MHz