From the APRS Special Interest Group mailing list, in an email from Matthew C Payne.

“It took Dave Norris (KG9AE) about a day to whip this up. Its pretty darn impressive what can be accomplished with this new API”

I’ve been playing about with it and its quite good, much more accurate as you zoom in. I’m looking at my car out in the atlantic at the moment. As I zoom in, it puts it in the carpark outside. Very cool.