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"The devices used will be subject to the approval of the Records Chairman."
"Tracking/recording devices shall be tested at least two weeks prior to the start of the attempt to ensure that the Records Chairman will be able to access the data."
So, if they did have an issue with his choice of tracker, it seems that it should have been known in advance of the attempt and it was the rider choosing to ignore their requirements unless, of course they didn't realise it wasn't a public tracker?
The UMCA's requirements were vague. The rules ask for "Live Tracking", he supplied something that he considered satisfied the "Live Tracking" requirement (Find My Friends app) so that anyone from the UMCA could see where he was at any point in time, but the UMCA want the Live Tracking to be public and not private/request-based, which they never originally said.
If the UMCA had been clearer in their original rules "You must have Live Tracking that is public and anyone can use to go and observe you, e.g. a SPOT tracker" then he would have been able to make a decision earlier.