How To Update Your Garmin GPS Firmware
Firstly, note that there are two parts to any GPS. The GPS unit itself and the operating system of that unit, also called the firmware. The second part is the detailed map software that is loaded either onto the unit or onto a memory card inserted into the unit.
Firmware Updates:
Firmware updates are free for all Garmin GPS units and the update files are available for download off the Garmin website. Garmin also have a download utility program called WebUpdater that you download once onto your computer and which you then run directly from your computer while your GPS unit is connected to your PC. The program will automatically identify your GPS unit, log itself into the Garmin database and download all the relevant update files directly to your connected Garmin GPS unit. These firmware updates also include any new or updated voice files, Bluetooth software (if your Garmin GPS unit is Bluetooth enabled), vehicle icons, firmware improvements and bug fixes for your unit. Once the program has run, you simply disconnect your GPS unit from your PC and let it reboot and update itself (this can take a minute or two depending on the unit).
Important Note: ALWAYS remove any memory cards from the unit BEFORE doing a firmware update.