Magellan RoadMate 300 Reference Manual page 14

SD Cards
7. SD Cards can be authorized for free in two ways:
Via the Internet. Select "I would like to request an
authorization code through the web" and click on Next.
Your default internet browser will launch and take you to
Magellan's Product Unlock Codes page. Select "Unlocking
an SD to use with your Magellan RoadMate 300".
Click on Continue.
Enter your E-mail address and password. If you have not
registered previously, click on "Click here to create an
account" and follow the instructions on-screen to create a
new user account for yourself.
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