I get why the IBA is somewhat specific, but I can claim that Bubbler GPS
PRO will provide tracking in a vast area that does not have cell service:
https://spotwalla.com/tripViewer.php?id=1c84f5c5627c0c6d99&hoursPast=0&showAll=yes
Much of Death Valley National Park has no cell service. As you can see by this weekend-long track, I went in and out of areas that did have cell service and it's fairly apparent that tracking is available. I have done a similar ride now for years and Bubbler Pro has done what it's claimed to do...continue to collect tracking data while out of cell service.
So, in reading the ride rules, it's a bit tricky to get (a) a receipt as close to the start as possible and (b) a receipt as close to the end as possible. Yet, the ride
duration is what is being corroborated by the required track file data collection requirement, as far as I can tell.
+ Get receipt at toll booth.
+ Ride to top of mountain...time starts.
+ (...ride, receipt, repeat...)
+ Ride to Furnace Creek or Beatty - get final receipt.
+ Ride to Badwater for final time stamp of remote data...time ends.
Until you get back to 'civilization' (Amargosa Valley, Beatty, Pahrump...Furnace Creek? Stovepipe Wells?), you just don't *exactly* know you have the data at the end of the ride or not.
All five of those bulleted items should be able to take place in a 24 hour window, I would think.