User id

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The user id in the Profile Settings is the users id number at Geocaching.com. The id number uses the numbers 0-9 and can be converted via a special version of base 31 (base 36 without the letters I, L, O, S and U) to get the coord.info/PR-link to the profile, the same conversion is possible to do for GCcodes to get the id number of the cache.