Magellan RoadMate 300 Reference Manual page 16

SD Cards
You are now ready to upload maps to your SD card.
By Calling Customer Service. Follow the directions as before.
Select "I would like to request an Authorization Code by
phone/fax". Select Next.
The dialog box will display the phone number to call along
with the hours of operation. When you have received the
Unlock Code, write it down in the space provided in this
manual (see page 11). Click Next.
Enter the Unlock Code in the blank field. Click Finish.
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