Hello!
"I'm not understanding what value needs to be put here. If I need to use information from my facebook app, what information should I use? " - please contact Facebook support to figure out what settings should be to have ability posting on Facebook.
"And how can I copy my labels from the "recordride" page to the "plot" page?
" - before navigating to plot page you need to save data to localStorage page Show event (for plot page) put data from localStorage to corresponding labels.
"Any luck with prompting the user to enable GPS tracking" - there is no way to know if GPS switched on or off. If it's switched off you'll get data through network (wi-fi, gprs etc.)
"How would I get altitude data" - Geolocation service returns altitude as well as latitude and longitude - you can use it as you wish.