It will presumably fall-back to finding the geographic area of your IP if a location is not provided/searched, though it had trouble with mine.
Just when you think the adventure is over, you might decide to try it in the browser and discover that it can also serve HTML:
Unfortunately, the search mechanism doesn’t work the same as it does at the command-prompt, if at all. So, I needed to provide a zip-code.
The same guy also produces a service to print QR-codes from the command-line using just the available resolution: