I own a Garmin GPS that I wanted to update. It’s about a year old and the maps are not up-to-date. For example, it does not include the new second Penang bridge. Garmin provides updated maps on its website but the installer runs in Windows. Since I did not have a Windows machine available, I had to find another way.
Turns out that Microsoft gives away time-limited virtual machine images of Windows, primarily for browser testing. So, I downloaded the smallest one – IE6 on WinXP. After that, it had to be extracted from the archive. This can be done by:
$ chmod +x IE6.WinXP.For.LinuxVirtualBox.sfx
$ ./IE6.WinXP.For.LinuxVirtualBox.sfx
Next, the extracted OVA file needs to be imported into VirtualBox and run.
After that, it’s just a matter of using the browser to download the update from Garmin and running the map.
Note: We just need to make sure that the Garmin is configured as a USB storage device and that it is attached to the virtual machine, instead of the host machine.
Technical Intercourse 
Great. I have a similar problem and it is common that my GARMIN will lead me to some wrong roads. ;-D