Follow the instructions to get Garmin Express running on your machine.More on this you don't have free product lifetime map updates available to you, purchase Garmin street map updates here.Simply plug in your Garmin device via its USB port, download and install Express for Mac or Windows, and open the application.
The main issues in updating GPS maps are determining which system your unit uses, and choosing which update is right for you.
Determine which type of global positioning system you use.
You may purchase street map packs as downloads, or as SD card updates.
I actually prefer SD card updates for their simplicity and ease of use.
Manufacturers offer updates for these maps on their individual company websites.