I don't understand your point.
If you can't get a signal for "live tracking" then you're in the same situation as a marshal stood in the place with no mobile phone signal, and so the box is still an extremely effective way of monitor who has reached the CP (and easier than the tag system or writing numbers down) - just without the live tracking you have wait until the box is back at HQ to download the data - in the same way that the marshal would have to bring a written list or a bag of tags back to HQ, only when you get there, the SI box takes seconds to download the information, rather than having to transcribe all the information from soggy bits of paper or by spending hours counting tags
The boxes themselves are autonomous and don't require any particular signal to operate - only if you require the live tracking for the info to be available instantly at HQ or more widely







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