If you have a Mac, Xcode has a moving GPS simulator. Download Xcode (free on the Mac App Store) and launch iOS Simulator. Open Safari in the simulator. Then, from the Simulator Debug menu, select “Location,” and then select one of three moving simulations. Alas, they are all located in the San Francisco Bay Area. The "Custom Location" option allows you to insert only one coordinate, not a series of them.
You can even ask a friend with a Mac to simply open their web application in their iOS simulator and let it work while they do other things.

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