What are ASR, SQlite, 3D, G2S, DB files on Garmin Devices

In this post i will try to explain you how to use the files that you find on this website

The files are located in a folder that is hidden, the folder`s name is “.System”. You have there the IMG(maps) files gmapbmap.img(main, basemap), gmapdem.img(DEM map) and some not so important folders, But the folders that we are looking for are ASR, JCV, G2S and SQlite.

If you can`t see hidden folders, go to tools/organize on windows explorer, click folder options and tick view hidden files and folders.

Now let see what are this hidden folders made for:

 ALWAYS, But ALWAYS BACKUP YOUR DEVICE before you start modifing folder structure.

In the ASR folder you will find the file the files that makes your device speak. Note that this might not be available on some devices, so if you can`t find this folder it means that your device dosen`t support voice.

If you update the maps you have to update the ASR files too, because, for example if you use CN US maps and NT US ASR files you will have no voice.
These files are XXXX.ASR and XXXX.SRX, remove pervesious ASR and SRX files before you copy the new ones!, Note that you CAN have more ASR files in the folder, if you have Both american and European maps. Do not change the name of the files!

To update Voice, copy ASR and SRX files into the following folders:

  • Device:.SystemASR Folder – for newer devices that has hidden .System folder.
  • Device:GarminASR Folder – for devices with no hidden .System folder
  • SD:GarminASR Folder – for other devices

NüRoute Technology: TrafficTrends & MyTrends

TrafficTrend is available on newer devices, it will give you infos about traffic flow and will help you calculate the fasted route.
MyTrends this is similar with trafficTrend, and your device must be equipped with a traffic receiver.

TrafficTrends and MyTrends are stored in these files:  XXXX.DB and XXXX.G2S to update them, you must copy them in:

  • Device\System\G2S Folder – For G2S file
  • Device\System\SQlite Folder – For DB file.


LANE ASSISTANT (Stored in map .img file)
Lane assistant is a feature that does not need any update, because is stored in the basic .IMG map file.

This Feature shows you the driving lane to follow.

Here is a demo picture

Video for The Lane Assistant Infos

Junction view is a more powerful line assistant. This not only shows you the colored line of the lane you should use, but it also shows you a picture of that junction with all the trees and buildings

To update juctions view you have to update the following files:

  • Device\System\JCV folder – If your .System is HIDDEN
  • Device\Garmin\JCV – for older device with JCV support
  • SD\Garmin\JCV  – for all other devices.

Do not rename The JCV files, just copy them in JCV folder. The JCV folder can contain more  JCV files, EXAMPLE JCV for CN Europe and JCV for CN North America.

This shows you a demo for Junction View

Another demo:

And a demo video:

3D Buildings (gmap3d.img)
This Features shows the most important buildings in 3D, mostly in big cities.

To update 3D Building you must copy gmap3d.img file in:

  • Device\System gmap3d.img, or
  • SD\Map\gmap3d.img

For Devices with hidden System folder

For other devices

  • Device\Garmin\gmap3d.img or,
  • SD\Garmin\gmap3d.img

You can use 2 different 3D buldings file if you name them corectly: one gmap3d.img and the other one gmap3d1.img, or t For example:


  • Device\Syste\gmap3d.img (North Amrica 3D)
  • SD Card\Map\gmap3d.img (South America 3D)

Time Zone (gmaptz.img file)

This file is always the same it should not be updated. It`s responsable for updating your device time when you go from a timezone to another. If you want to update it or install new maps you should know the the gmaptz.img file is located in:

  • Newer Devices: System\gmaptz.img
  • Older Devices: Garmin\gmaptz.img