In reply to johnboybuchan:
Do you mean Park Run (i.e. an organised run, with their own system of timing tokens), or a run in the park?
GPS data logging does not need mobile data*, or even a mobile signal (for most sanely-designed phones). It just needs to be able to see the satellite constellation. Once you have logged your GPS data, you can do what you want with it; strava, google earth or any number of mapping or route-loging/analysis/bragging systems.
* mobile data can be helpful to get a hot start if you've only just turned the GPS receiver on; it can download ephemeris data from an A-GPS service, and start getting position fixes immediately. Otherwise, turn on the GPS receiver about 15 minutes before you need to start logging, or download A-GPS data via wifi no more than four hours before you need to start logging. 'GPS Status' is a useful app to have, as it does the A-GPS download, and shows you constellation, position and stats on signal strength, etc.
Post edited at 17:39