Go to http://www.garmin.com/express
Download the software for Mac or Windows
Register your device if you want special promo.
You’ll see available software and map updates.
You’ll be able to install with a simple click
If there’s not enough available space, you must choose a region (or buy a memory card)
Regions you can choose : US & Canada, Lower 49 states, Southern US & Mexico, West, East, Lower 49 states SW, Lower 49 states NW, Lower 49 states SE, Lower 49 states NE, Canada + Border States, Full Coverage of North America
From Garmin Express, you can get all the manuals and Quickstart guide for your device (click the device tab)
You can use Garmin Express to backup your data and install new voices