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## OS X

A cache by Huga and Sam Message this owner
Hidden : 11/09/2002
Difficulty:
Terrain:

Size:  (regular)

#### Watch

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### Geocache Description:

A true multi-part cache with the final part near Stetchworth in Cambridgeshire.

The above co-ordinates are false. They merely indicate the general area so that prospective cachers know where this final part is.

I'm not going to give much location information here, since that'd give away the final location. So there :Þ The relatively high difficulty reflects the fact you have to collect several other caches of varying difficulty and do the maths, and the relatively high terrain is because of a steep slope and slippery path to get to the final cache.

In order to get the co-ordinates for this cache, you must visit 4 of my other caches. With each (usually inside the lid) is a set of co-ordinates.

Please note: Each logged finder must have visited each of the four caches above. To clarify: If Bob visits Devizes and Chips'n'Ham, and Alice visits Polar Bear and Walk in the Park, then neither can log OS X as a find if they combine co-ords. Team Alice and Bob can log a find, but Alice and Bob cannot individually log finds. The point of this cache is to get each finder/team to visit each of the first four caches.

How to find the location of OS X

• With a map
• Get an OS Landranger Map (you can work out which one from the co-ordinates given)
• Draw a line between co-ordinate sets 1 and 2
• Draw a line between co-ordinate sets 3 and 4
• Where the lines cross, that's your spot!
• Calculate the crossing point mathematically.
• Calculate the equation of the line through co-ordinate sets 1 and 2 - use y = mx + c.
• Calculate the equation of the line through co-ordinate sets 3 and 4 - use y = mx + c again.
• Find the point where the lines intersect. Solve the simultaneous equation of the two lines you've just calculated to get the Easting and Northing of the crossing point. This way will be far more accurate than drawing on a map/
The co-ordinates given are OS Landranger grid references, using the OSGB datum. These are easier to work with in the simultaneous equations than degrees, minutes and seconds.
Once you've got the final location, you can either:
1. Plug the waypoint into your GPRs using the OSGB Datum and British Grid format
2. Convert the grid reference to a Latitude and longitude using Chris 'n' Maria's Waypoint Workbench
3. Look up the grid ref on the relevant OS map and use that.

The cache is a medium-sized ammo box - 18x15x27cm. Original cache contents were:

• Case for a Nokia 3210 phone
• Battery for a Nokia 3210
• 3 Chunky Kitkats for hungry travellers
• Duck beanie baby
• Pocket torch
• Aussie Pen (from Forgotten Souls)
• 10 Chubby Wax Crayons
• Fox toy (because we caught the CIN Fox and thought it appropriate)
• Flashy bouncy ball
• Diver Keyring we got off TheCat on the foxhunt
• Bottle of water for thirsty travellers
• Powerball with a dinosaur inside
• Windchimes
• Set of allen keys (metric & imperial)
• Log book and 2 pens
• Spare zip-lock bags

This cache was replaced in January 2015 and its new content were:

• Make your own snow globe
• SATA cable
• Couple of sticks of RAM
• PCI SATA card
• Birthday book
• Couple of bouncy balls
• Beach spade set for better weather

Happy hunting!

Va gur obggbz bs gur fznyy inyyrl/thyyrl gb gur fbhgu bs gur sbbgcngu vf n ynetr snyyra gerr, oynpxrarq jvgu ntr. N srj zrgerf fbhgurnfg naq hc gur bgure fybcr vf n fhfcvpvbhf-ybbxvat cvyr bs onex.

Decryption Key

A|B|C|D|E|F|G|H|I|J|K|L|M
-------------------------
N|O|P|Q|R|S|T|U|V|W|X|Y|Z

(letter above equals below, and vice versa)

Find...

### 94 Logged Visits

67      2      18      1      1      1      1      3

**Warning! Spoilers may be included in the descriptions or links.