The file containing the UPS zone information, specified relative to the catalog directory unless it begins with a /. It can be in the format distributed by UPS or can be in a tab-delimited format, with the three-letter zip prefix of the customer used to determine the zone. It interpolates based on the value in mv_shipmode. A user database named the same as the mv_shipmode variable must be present or the lookup will return zero.
IMPORTANT NOTE: Zone information and updated pricing from UPS must be obtained in order for this to work properly. The zone information is specific to a region!