Skip to content

Keep your distance! (2) Mystery Cache

This cache has been locked, but it is available for viewing.
Hidden : 10/29/2011
Difficulty:
2.5 out of 5
Terrain:
1.5 out of 5

Size: Size:   small (small)

Join now to view geocache location details. It's free!

Watch

How Geocaching Works

Please note Use of geocaching.com services is subject to the terms and conditions in our disclaimer.

Geocache Description:

This cache is not located at the posted coordinates. It is suggested that you solve the puzzle at home before looking for this cache.

There has been a recent occurrence where up to 100 caches were squeezed into a park of limited size. Easy I hear you say? Let’s look at the mathematics behind this optimization problem.

Let’s say you’ve found this great park land, heaps of hides for new caches (in fact, you can freely choose where to place them), The Ump is in a good mood and has reserved a weekend or two (or ten) for review – and you are about to hide as many caches as possible in this park.

You will obviously need to do this without getting into trouble with The Ump (and the GC rules).



  1. If the park has dimensions 1610m*1610m, how many caches maximum could you place?
    Let this number be ABC.
  2. How far at a minimum would a cacher have to walk if they wanted to find all of these caches? Assume the cacher is able to walk directly to each cache. The total distance is measured from the first to the last cache.
    Let this distance be DEFGH(metres)

The rules:

  • Minimum distance between two caches is 161 metres
  • In addition, you will also have to keep a distance of at least 161m from the boundaries of the park.

The cache can be found at
S37 5A.D(E+F)C
E145 0E.(B-D)(G-F)(H-D)

The cache location can be checked here:

Geochecker.com.

I would like to thank Alansee for beta testing this puzzle!

Credit goes to quiet1_au for improving on my solution - cache prize to be awarded!

Additional Hints (No hints available.)