I can guess - it's for ShortHaul Nigel, so he can feed in 2 numbers from the GPS and know where he is for a change! (wouldn't it be better if the thing had a Garmin interface, to eliminate
that source of error
P.S. - Checked the page, and clicked on "groups" and got a selection including "Animals", "Bushes", and "Childrens' Comics"
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---- "Per Ardua ad Mixas" ----
(Through hardship to the bars)