I have often wondered why ppl keep uploading the large JVC file to mega.nv for others to download instead of just posting where they got them from. So, I asked COPILOT - where to download the garmin Large JCV Files? - Simple....
To get them officially, use Garmin Express, choose "install files to device and computer," and find the hidden files in
C:ProgramDataGarminCoreServiceDownloadsMap.....
As you drill down past that, there are 3 files at the end of each path.
For the current update: ACCORDING TO COPILOT == (please read to the end)
D224800B.img (@ 608,976KB under 'fusionna")
= North America DEM / Junction View
= Found in zūmo XT and other devices with full CN NA NT maps. Large file (~600 MB+) supporting detailed lane guidance.
D9644110A.img (@ 1,207,584KB under "na"... "img"..."006-d9644-11"...)
= Junction View for U.S.-only maps
= Part of Garmin’s split map update (2025.20 and similar). Covers United States only with full JCV images.
D9643110A.img (@ 3,661,056KB under "na"... "img"..."006-d9643-11"...)
= Junction View for Canada/Mexico maps
= Companion file to D9644110A. Provides JCV coverage for Canada and Mexico.
Why Multiple Files Exist?
- Device compatibility: Some Garmin units can’t handle the largest “full” JCV file, so Garmin distributes multiple versions.
- Regional split: To reduce file size and improve performance, Garmin separates JCV data into U.S. vs. Canada/Mexico.
SO, according to this, the LARGE file is NOT the one to use in the USA.
If you drive all of NA, then you have to install BOTH D964... files.
COPILOT:
Interpreting the three files
- D224800B.img (smallest) → Likely a “lite” JCV or DEM-support file, minimal coverage.
- D9644110.img (middle) → U.S. junction views, compressed for efficiency.
- D9643110.img (largest) → Canada/Mexico junction views, bundled together with higher-resolution images.
Why would the Canada + Mexico file be the largest according to COPILOT = because you can't trust COPILOT.
The truth is, according to a search using my browser, checking the file headers then challenging COPILOT:
COPILOT's response:
You’re absolutely right, Bill — thanks for catching that. Let’s lock this down cleanly so there’s no more ambiguity:
???? Correct Mapping (per the IMG headers)
• D224800B.img → Smaller “lite” JCV/DEM-support file.
• D9644110A.img → Canada & Mexico Junction View coverage.
• D9643110A.img → United States Junction View coverage.
I have often wondered why ppl keep uploading the large JVC file to mega.nv for others to download instead of just posting where they got them from. So, I asked COPILOT - where to download the garmin Large JCV Files? - Simple....
To get them officially, use Garmin Express, choose "install files to device and computer," and find the hidden files in
C:ProgramDataGarminCoreServiceDownloadsMap.....
As you drill down past that, there are 3 files at the end of each path.
For the current update: ACCORDING TO COPILOT == (please read to the end)
D224800B.img (@ 608,976KB under 'fusionna")
= North America DEM / Junction View
= Found in zūmo XT and other devices with full CN NA NT maps. Large file (~600 MB+) supporting detailed lane guidance.
D9644110A.img (@ 1,207,584KB under "na"... "img"..."006-d9644-11"...)
= Junction View for U.S.-only maps
= Part of Garmin’s split map update (2025.20 and similar). Covers United States only with full JCV images.
D9643110A.img (@ 3,661,056KB under "na"... "img"..."006-d9643-11"...)
= Junction View for Canada/Mexico maps
= Companion file to D9644110A. Provides JCV coverage for Canada and Mexico.
Why Multiple Files Exist?
- Device compatibility: Some Garmin units can’t handle the largest “full” JCV file, so Garmin distributes multiple versions.
- Regional split: To reduce file size and improve performance, Garmin separates JCV data into U.S. vs. Canada/Mexico.
SO, according to this, the LARGE file is NOT the one to use in the USA.
If you drive all of NA, then you have to install BOTH D964... files.
COPILOT:
Interpreting the three files
- D224800B.img (smallest) → Likely a “lite” JCV or DEM-support file, minimal coverage.
- D9644110.img (middle) → U.S. junction views, compressed for efficiency.
- D9643110.img (largest) → Canada/Mexico junction views, bundled together with higher-resolution images.
Why would the Canada + Mexico file be the largest according to COPILOT = because you can't trust COPILOT.
The truth is, according to a search using my browser, checking the file headers then challenging COPILOT:
COPILOT's response:
You’re absolutely right, Bill — thanks for catching that. Let’s lock this down cleanly so there’s no more ambiguity:
???? Correct Mapping (per the IMG headers)
• D224800B.img → Smaller “lite” JCV/DEM-support file.
• D9644110A.img → Canada & Mexico Junction View coverage.
• D9643110A.img → United States Junction View coverage.
Now you know.........