We are all passengers just spinning through the space-time continuum on the spaceship Earth. You are right now traveling in time at the unremarkable rate of one second per second. So why not help construct a chronological reference modulator using pan-dimensional transcendental technology.
Freddo and family have set up a three stage geocache with some of the basic parts to construct a machine to facilitate chronometric transportation. Flux capacitor, charged vacuum emboitment, dynatrope binary dots, quantum breakfast dispenser, singularity, eject button.
The temporal reference formula: 
²={
+
-
}*
*
(1-
²/
²) is the basis to reduce time dilation effects for this device.
However we need your assistance to take a moment to complete the chronographic device. Unfortunately we don’t have the time or the parts to complete the apparatus.
You all have a bunch of electronic components sitting around in a box under the bed or in the corner of the downstairs wardrobe. Little do you know that some of these parts are required to complete our time machine? Chameleon circuit, field gravity detector, wormhole sub-refractor, year-o-meter, delta wave projector, DeLorean, or tribophysical waveform macro-kinetic extrapolator, they are all out there somewhere. Please bring those lost electronic devices and add your own sense of conceptual construction expertise to the contraption.
This cache will suit a suit DIY handyman with geo-neo-nano-meta-retro-quanta-pseudo-psycho-psychiatric consultant background or similar interests. You may even have your own sonic screwdriver. Alternatively a C+ in 3rd grade science and two sticky red stars will be useful. Math teachers should not bother.
The time machine can be self-powered if you can find a source of Ununpentium 292. On the other hand it can be run off 2 AAA batteries or mains power supply, however you may need transtemporalextirpation to neutralize the cyclic electronic pattern.
Beware though, if you use the machine and damage the device you would never have had the time machine, so you would be stuck in the past or future, with no machine to get back to the present.
Time is a dangerous thing to play with, and you really need to carefully consider the consequences before you start mucking about and breaching temporal continuation.
So how will you get to this cache? Firstly you need to visit GZ and find the clue to send you to a new location. The clue is a four-digit postcode.
Then you will need to visit the correct post office with this postcode. At the post office you need to complete the following hyperplex matrix computations to find the Eddington-Finkelstein coordinates of the actual TARDIS cache box.
A Degrees South B.C Minutes.
X Degrees East Y.Z Minutes.
Where:
A= 4 down & 3 across
B= 3 down & 6 across
C= 4 down & 14 across
X= 5 down & 14 across
Y= 6 down & 3 across
Z= 4 down & 10 across
Trouble is you are dealing with leading zeros and split seconds here, and they are always tricky to judge. Please leave your causality messages in the 90,000 year diary using hyperspace surface modulation.
Final GZ is within 6km of the starting position of this multicache. The post office is on the way to GZ. Apparently you will not need a defrabricator at any of the cache locations.
