Add this to the callback function:
Rename the Axure variables if you want. You can then use them to format the link like you posted. I don't know how the URL is supposed to be formatted but it's probably something like:
You'll have to modify that to format it correctly probably. It's also possible that the lat and lng might need to be formatted by the callback function before setting the Axure variable. Just a guess because I have no idea what the Maps URL is expecting or what the device location API returns.