How do I add a new garmin to my account

 
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ME

If you mean your account here at POI Factory

Go to MyAccount => Edit => Additional Information and type your new Garmin info into the GPS Models text box

Quite Easy

Connect your Nuvi to the computer via USB cable.

Click on the link below:
https://my.garmin.com/mygarmin/registrationGettingStarted.ht...

Allow the Communications Plugin to install.
Follow the instructions.

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Nuvi 2460LMT 2 Units