- Difficulty:

- Terrain:

Size: (small)

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### Geocache Description:

*No part of the cache is located at the given coordinates, but as the cache is a bit about geometry, Triangle Island seemed a good spot for the icon!*

Boy it’s been a little while since the last of these! This next instalment of the Hawkesbury Heights will take you to probably one of my favourite views so far. But to get there will require a short boat trip or two and a couple of short walks, or some VERY LONG drives and one 20+ km walk.

**Welcome to Hawkesbury Heights #8**

To find the cache, you will travel to three different waypoints, collecting information from each, to calculate a distance. Much like how earthquake calculations work, you find out how far away the cache is from each location but will not know the bearing. Using a ruler, pencil and drawing compass to complete a method known as triangulation (where the three circles intersect, one circle per waypoint), leading you to the cache.

Below is a step by step guide of all the waypoints for this multi and instructions to get to GZ. Some of the questions require a certain answer to be chosen. At the end of each question is a square bracket with a number. So something like [A=6]. Keep a record of all the correct answers as they will be used for the final location.

**WP 1. Spencer**

Getting up here requires climbing the hill on the north side of town. Once at the “crown” walk to the right hand side (north eastern) and climb up. Proceed along the cliff line to the coordinates to find this:

Here, you will find a cable which is:

a) Old, rusty [A=0]

b) Galvanised [A=1]

c) Black insulation [A=2]

d) Brown insulation [A=3]

Let [B ]= Number of times the wire wraps around the tree

Just to the north of the cable, stand on the edge of the cliff and look over the edge:

a) A sharp shark tooth like outcrop with an unusual fallen rock [C=3]

b) A large honeycomb wall which looks like it has been blackened by burning [C=5]

c) A freshly collapsed cave roof with large angular boulders [C=9]

**Now multiply: ABC x10**

**WP 2. Lower Gentleman's Halt**

From Spencer, travel over the river to the stone jetty. Secure your craft firmly as you may be gone for some time. Continue up the trail and turn right, making your way to the way point.

At the WP2 coordinates you will find:

a) Chimney [D=1]

b) Water tank [D=7]

c) A large sign [D=5]

d) An old boat [D=8]

With :

a) Bullet holes in two parallel lines [E=3]

b) A large tree growing in or around the feature [E=4]

c) Paint splattered over the item [E=5]

d) Extensive rust [E=6]

Continue to the top of the knoll, which plant dominates this area?

a) Angophora costata [F=9]

b) Doryanthes excelsa [F=8]

c) Eucalyptus pilularis [F=7]

d) Xanthorrhoea [F=6]

**Now multiply: DEF x10**

**WP 3. Gentleman's Tower**

To get to this waypoint will require a little trek up the hill. From the "plant type" ([F]) knoll question, you may continue to the south overland until you reach the trail. However, I found this way quite arduous and really probably added time. You may like to make your way back to the camping area and follow the trail behind the toilet. This skirts around the knoll and appears to be an overgrown 4x4 track. From here, its pretty hard to get lost. Continuing up the hill, there are some fantastic views from a few large sandstone caves:

Once at the tower, find the north eastern leg. Here you will find some white letters and numbers on green paint.

There are [G] 6's in the sequence

There are [H] letters and numbers in the sequence

There are [ I ] 4's in the sequence.

**Now multiply: GHI x10**

**Final GZ**

As initially mentioned, to find GZ, you will use a method known as triangulation. All three points are required for the most accurate projection of the location. You will need to take the map (provided) that you have already printed out at home (ensuring that each grid square is 4cmx4cm). After visiting all three locations, plot all three locations on the map. The map I have provided will require you to set the GPS to MGRS (grid reference system) ensuring that it is 84 datum. REMEMBER THAT ALL MEASUREMENTS HAVE BEEN MULTIPLIED BY 10, as this converts the numbers into 'meters'. To convert this integer to cm for the map, divide by 250. This is now the measurement in cm that you will set the drawing compass to.

As there is some GPS error in the measurements, there may be a little 'play' in the numbers. However, the cache is in a very obvious location at a bit of a high point with some typical Elev8!on views. Please do not post any photos that reveal GZ. I have provided a hint photo to help exactly locate the cache. It is in a bit of a precarious spot, nothing dangerous though, but all fours are a good idea. Overall on ground terrain is probably about a 3.5

I have provided a map which can be printed out. Ensure each square in the grid represents exactly 1km and should measure exactly 4cm across when stretched to an A4 (standard international size).This ensures that the print out is the same scale as the original and can easily be done on one of multiple computer programs that many will have. If you are unable to do this, you may email me for help or try an different method online. Alternatively just a screenshot of one of the many terrain maps on Geocaching.com to scale will do the same thing.

It is very important to mark where each waypoint is on the map. If you are using the map that i have provided, you will need to convert the coordinates to MGRS (grid reference system) ensuring that it is 84 datum (what many will know as the standard grid reference format). Also, if you are a little more tech savvy, there are ways to let the hand held device to do all the work for you. Remember, there are multiple ways to get the same end result, the choice is up to you.

Happy Caching!!!

**
Additional Hints**
(Decrypt)

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