Reverse Cache Box (Maxipimpf)

A Maxipimpf Reverse Cache Box is a hot/cold distance-box Wherigo. Its final coordinates are hidden behind three six-digit codes the owner publishes in the cache listing. Enter those 3 codes to calculate the coordinates, or enter coordinates to create the three codes. Coordinates may be entered as Degree Decimal Minutes (DMM), Decimal Degrees (DD), or Degrees, Minutes & Seconds (DMS).

Why decoding and encoding are not mirror images: each set of codes is 18 digits, and the last two digits are instructions that tell the box how to unscramble the other 16 (one digit sets a shuffle order, the other a digit shift). The cartridge picks those two digits at random every time it builds a code, so one coordinate can be written as many different valid code sets, and every one of them decodes back to the same point. Decoding is exact and unique. Going the other way, this tool always uses one fixed shuffle, so the codes it generates will usually look nothing like the ones in the cache listing even though both point to the same spot.

The codes keep 5 decimal places of degrees (about 1 meter). For repeatable results, enter coordinates as Degree Decimal Minutes (DDM). DDM values always decode back to the same DDM.

Reference: Maxipimpf’s original Reverse Cache Box cartridge on Wherigo.com.

Drag the marker to fine-tune the location. The DDM coordinates and reverse cache box codes update as you move the pin.