Garmin 400W Series User Manual (English)

Other manuals for Garmin 400W Series

Instructions26 pages

Manual22 pages

Supplemental Flight Manual16 pages

Pilot's Guide Addendum24 pages

Questions and Answers:

T
Terrance OrtizAug 25, 2025
How to fix Garmin GPS signal levels that are very low?
- K
  Kimberly CrossAug 26, 2025
  Low Garmin GPS signal levels can be caused by a few things. First, check the GPS antenna installation, connections, and cable routing to ensure they are correct. The GPS antenna should be mounted on top of the aircraft. Second, make sure that the aircraft is clear of obstructions such as hangars, buildings, and trees. Finally, RF interference at 1575.42 MHz from VHF COM can be the cause. Try moving the GPS antenna further from the COM antenna or adding a 1575.42 MHz notch filter in the COM coax. You may also need to fix or replace the COM or disconnect the ELT antenna coax to check for possible re-radiation.
M
Melissa AriasAug 26, 2025
What to do if Garmin 400W GPS OBS Resolver won’t calibrate?
- J
  Jason BirdAug 26, 2025
  If your Garmin GPS OBS Resolver won’t calibrate, check the resolver specifications and wiring.
K
Kevin PerkinsAug 26, 2025
How to troubleshoot a Garmin 400W 400W Series unit that does not power on?
- R
  Richard DavisAug 27, 2025
  If the 400W Series Garmin GPS unit does not power on, ensure power is connected to the main 78-pin connector P4001, pins 19 and 20, and ground to P4001, pins 77 and 78. Check the circuit breakers and main avionics switch.
M
Mrs. Amanda Lewis DVMAug 27, 2025
Why is my Garmin GPS not computing a position?
- J
  James FrostAug 27, 2025
  Your Garmin GPS may not be computing a position because it is not receiving signals. Check the GPS antenna connections and ensure the aircraft is clear of obstructions like hangars, buildings, and trees. Alternatively, the unit may need up to 20 minutes to complete its cycle.
E
erika21Aug 27, 2025
Why is my Garmin 400W 400W Series unit not transmitting?
- D
  Dr. Justin ScottAug 27, 2025
  If your Garmin 400W Series unit isn't transmitting, check that the PTT (mic key) input is pulled low for transmit. Also, ensure that the power input is connected to the COM 25-pin connector P4002 11 and 12 and ground to P4002 21 and 22. Finally, the input voltage may be too low; increase the input supply voltage to >12VDC (>24VDC for 430AW models).
Z
Zachary TorresAug 27, 2025
How to solve a Garmin GPS Aviation database integrity error?
- S
  Shirley ScottAug 28, 2025
  If your Garmin GPS shows an aviation database integrity error, it means the 400W Series unit has detected a problem with a database on the NavData® card. The data is not usable, so try reloading the information onto the card. If that doesn't fix it, replace the card.
M
Michael PughAug 28, 2025
How to fix Garmin GPS data transfer cancelled due to version mismatch?
- A
  Amy RichardsonAug 28, 2025
  A data transfer during a unit-to-unit crossfill was cancelled because the database versions of the two 400W-series units are not identical. Update the databases so they match.
J
Joshua ParkerAug 25, 2025
What to do if my Garmin 400W 400W Series unit does not power on?
- G
  Gregory CampbellAug 25, 2025
  If your Garmin 400W Series unit isn't powering on, ensure power is connected to the main 78-pin connector P4001, pins 19 and 20, and ground to P4001, pins 77 and 78. Also, check the circuit breakers and the main avionics switch.
J
Jennifer ReedAug 29, 2025
Why is the sidetone level on my Garmin 400W too low or too high?
- J
  jamesclarkAug 29, 2025
  If the sidetone level on your Garmin GPS is too low or too high, it could be due to the type of headsets you're using, or the level simply needs adjustment. You can adjust the sidetone level on the COM Setup page.
R
Robin OwensAug 30, 2025
What to check if Garmin GPS is not responding – check GPS antenna?
- T
  Terry DeleonAug 30, 2025
  If your Garmin GPS is not responding and prompts you to check the GPS antenna, verify that the center conductor is not shorted to the braid in the coaxial cable.

Garmin 400W Series Specifications

General

Display Size	4.3 inches
Display Resolution	480 x 272 pixels
Preloaded Maps	Yes (City Navigator NT)
Waypoints/favorites/locations	1000
Lane assist	Yes
Voice prompts	Yes
Bluetooth	No
FM traffic compatible	Yes
Receiver	High-sensitivity GPS receiver