The 235 sounds like a good choice, but the battery life is not that good for something like this. You'd need to send him out with 2 or 3.
He HAS A DAMN WATCH that should be plenty good for this. And yet they still haven't been able to provide data (which at this point is probably fudged).
They can do a 45 minute facetime with a runnersworld reporter, but they can't upload data. This is laughable.
The numbers from the west section, coupled with playtime in casinos and side trips, coupled with the fact that he's only getting sunburnt and blisters NOW... in Illinois, weeks into the adventure. He had an unbelievable run out west. I mean that literally.