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To upgrade your Nuvi you will need two things. A windows or mac computer with an internet connection.
And you will also need the data cable for your Nuvi to connect to the computer. Since you dont have one, you can order one here at a discount.
Once you have the cable, all you need to do is download and install t he free garmin express program from here.
Once you have installed that program on your computer. Start the Garmin express program.
It will ask you to connect your nuvi to the computer and turn it on. Once you have done that, It will let you install any and all updates available, with a few clicks.
If you have any further questions or concerns, let me know!
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Senior Technician and Network Switching Systems Operator / Maintainer.