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GC Number / GC ID
Convert between geocache GC codes and numeric IDs.
This tool uses a custom base-31 conversion to convert the GC Number to or from the GC-ID. The characters used for the base-31 conversion are 0123456789ABCDEFGHJKMNPQRTVWXYZ (the letters ILOSU are omitted). When converting from a base-31 GC-ID back to its original numerical ID, subtract 411120 due to the cache numbering change after cache GCFFFF.