Hello David and Welcome to Just Answer,
The Magellan part number for that USB cable is AN0203SWXXX, and you can get that cable at almost any computer or electronics store. You may even be able to find them at an office supply store - just take the device with you and VERIFY that the smaller end actually fits into the device.
It is really a pretty common cable, with the USB "A" connector on one end (for connecting to the computer) and the "Mini-USB" connector on the other (for connecting to the device).
As a reference, I have a link to one such cable - listed on Amazon.
Click Here --> http://amzn.to/2elx7ej
Please let me know what you find or if you have any more questions.
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