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In order to use the Google Maps functionality within the program you need to obtain a Google Maps API Key. That's a fancy name for a long string of jumbled-looking text characters that allows Google to identify the user that is requesting a map. According to the Google documentation:
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<blockquote cite=“https://developers.google.com/maps/documentation/javascript/tutorial#api_key”>
“Using an API key enables you to monitor your application's Maps API usage, and ensures that Google can contact you about your application if necessary.”</blockquote>
For example, if you exceed the daily usage limit Google would know whom to contact.