Magellan RoadMate 300 Reference Manual page 15

SD Cards
Select the type of SD card you wish to authorize. Next, enter
the serial number you wrote down. Continue to enter the
required information and click on Continue.
Your Unlock Code is displayed. Make sure you write down the
Unlock Code in the space provided in this manual.
Select the code in your browser. Right-click on the text and
select Copy.
Right-click on the empty field and select Paste or enter the
Unlock Code. Click on Finish.
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