Hy Ryan! this is a nice project, so we will try to help you all as its possible.
There is no a Thinger.io funcionality that collect data directly from web to device but, you can use “Space channel” from IFTTT to make a recipe with this data and send it to Thinger.io server with a “Maker channel”. You can see a tutorial here: https://community.thinger.io/t/make-your-iot-things-react-to-hundred-of-ifttt-events/41
Other way could be download all HTML text from isstracker.com and parse it to extract the location, but it will be much difficult.