Maybe due to the cement factory and the quarries there the city border line of Vienna makes a sudden sweep to the left and then back again, like a small appendix. The tour takes about 2 hours one way, and about 4 hours round trip. The path is mostly flat, but there are some steep descents and a lot of rocks and roots.

You should take a flashlight and/or a sheet of paper together with pencil with you, to ease the numbergetting at Stage 2.
At stage 3 you could visit Rodaun Rocks as a nice interlude (don't forget to study the logs for hints), the Bücherkübel and P13#0146 Wiener Hütte later at the Wiener Hütte.

Stage 1
N1 48° 7.911 E1 016° 15.321

Here you can see the main entrance to a school guarded by a saint woman.
Look at the first name of her, convert all vowels into numbers (A=1, B=2,...) and sum them up to get A

Stage 2
N2 = N1+(a*4-13)/1000
E2 = E1-(a*10-27)/1000

Here you should find a small white boundary stone.
It marks a corner of ones real estate and it has a 3-digit odd (ungerade) number on it, take it as B (Hint: Easier done with a flashlight to increase the contours or carboncopied with paper and pencil).

Stage 3
N3 = N2-(b-a*5+1)/1000
E3 = E2-(a*3+b-1)/1000

Take a seat, and catch your breath again. How many seating-accommodations are within a radius of 20 m (the big wooden one counts as one)?
Remember their number as C
Maybe make a small detour to Rodaun Rocks?

Stage 4
N4 = N3-1/1000
E4 = E3-((a+b)*c/2)/1000

The first undisturbed panoramic view to a large quarry (Steinbruch).
Is it in direction:

• SE? Then D is 3
• SW? Then D is 5
• W? Then D is 7

Stage 5
N5 = N4+(a-c*2)/1000
E5 = E4-(a+b+c*2+d*3)/1000

The reception was rather bad here. When standing close to a bench on a clearing, go about 20 meter in direction 340°.
You were able to see a neat devotional shrine mounted to a tree, but it has gone to heaven. If you pray to the Godmother, who is asked for help?
Convert the last vowel into a number (A=1, B=2,...) and get E

Stage 6
N6 = N5-((c+d)*(c+d)*e)/1000
E6 = E5-(b*c-a*2+7)/1000

A resting place is guarded by a green dragon with a rotten breath ((c) PlanetEarth). Some identical letters are imprinted on its head.
How many of them (just the identical ones) can you see ? Take their number as F

Stage 7
N7 = N6-(b+e)/1000
E7 = E6-(b*4+a+c+d+e+f*2)/1000

A misbehaving hiker has carved a 4-letter male first name into this tree.
Convert the last letter into a number (A=1, B=2,...) and get G
Stay on the road leading west until you arrive at the

Junction
N 48° 7.677 E 016° 13.084

Now you can choose:
If you want a break at a nearby tavern with food and beverage, continue on route A.

Otherwise take route B.

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Route A:
Tavern
N 48° 7.658 E 016° 12.522
Have a break at the Wiener Hütte, accomodated also with a small playground.
Attention: Closed each Thursday and Friday !!

And maybe also a visit to the Bücherkübel ?
When leaving, don't forget to visit

Stage A1
NA1 = N7-(b+e)/1000
EA1 = E7-(b*a/2-204)/1000

A rather unexpected company is mentioned here on this sign, located in Kaltenleutgeben.
Even their phone number is written here.
Add the second and the third digit to get H
Take the 8th and the 9th digit as 2-digit number, and add the 7th digit, you get J

In addition you could visit P13#0146 Wiener Hütte on your way downhill.

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Route B:
Stage B1
NB1 = N7-(b+2*c)/1000
NE1 = E7-(a*d+b*3)/1000

The once colorful stripes on the two trees on both sides of the small path are almost faded, so look out for a big tree with a horizontal two-color marking.

• Is it blue/white? Then H is 2
• Is it blue/yellow? Then H is 3
• Is it red/white? Then H is 4

Walk on downhill.

Stage B2
NB2 = NB1-((c+h)*h)/1000
EB2 = EB1-(c*h*h)/1000

On a landmark you can see two encarved letters and some digits on opposite sides.
Just use the uppermost line, convert all (four) letters into numbers (A=1, B=2,...), and sum them up to get J
Walk on downhill.

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Stage 8
N8 = N7-(a+b+g+j*2-9)/1000
E8 = E7-(b*3+j*2+G-f+23)/1000

As the asked dust measuring instrument has been removed, a red-white thing blocks the way, too.
How many white stripes are here?
And how many vertical circular tubes can be seen?
Take the sum as K

Stage 9
N9 = N8-(j-g+2)/1000
E9 = E8+(j-K+23)/1000

Turn west at the opposite side of the post.
An ancient stone ramp welcomes you, use it to advance to

Stage 10
N10 = N9-(h*k-c)/1000
E10 = E9-(h*k+e)/1000

Again the reception was quite bad. Walk about 20 meters in direction WSW (250°), and you find a large object.
As all registered ones, it has a number painted in red. Sum up all digits, and take the value as L.
Walk through the narrow pass at the right side and enter the

Cache area
Encounter a large rock formation where about 40 meters to the west there are two caves, now called left cave and right cave. Turn right and a broken sculpted stone construction lies on the ground. How many heads are missing ? Take their number as M.
But other things are still here. How many cornucopias can you see (Füllhörner) ? Take their number as N.

Cache
Calculate ((g + l)* m) + (k * n)
The Result is:

• 44: Search at the left side of the left cave in the west
• 47: Search at the left side of the narrow path facing eastwards
• 51: Search at the left side of the lower right cave in the west
• 78: Search at the right side of the left cave in the west
• 86: Search at the right side of the narrow path facing eastwards
• 92: Search at the right side of the lower right cave in the west

The cache is a deep-freeze box (size 23 x 13 x 5 cm ) and initially contained:

• cachenote (please do not remove)
• logbook (please do not remove)
• pencil and sharpener (please do not remove)
• ballpoint (please do not remove)
• flubber
• nail tattoos
• small measure tape
• plastic plant

If you are eager for more caches, you can continue with Föhrenberg, but it is not the shortest way back to your starting point.

V 1.02 (corrected vacation date, changed phrase at cache area)
V 1.03 (added reference to Bücherkübel, german description, A1/B1/B2/St10/Cache area rephrased)
V 1.04 (St2 corrected cause its an odd (ungerade) number, not a prime number, shame on me)
V 1.05 (vacation of tavern ended / Urlaub Wienerhütte beendet)
V 1.06 (directions at cache corrected at last / Himmelsrichtungen beim Cache endlich korrigiert)
V 1.07 (link Cache McBurney's Point added / hinzugefügt)
V 1.08 (vacation of tavern / Urlaub Wienerhütte)
V 1.09 (stage 8 added to hints)
V 1.10 (stage 8 replaced)
V 1.11 (McBurney's Point archived)
V 1.12 (decision 51/78 exchanged;rodaunrocks hints)
V 1.13 (detour cache added; hint Stg.2; new Stg.B1; short hyperlinks; duration inc.)
V 1.14 (stg 5 rephrased, gone)
V 1.15 (cache orientation)