NorthEast Ibiza Moutain Treasure

Another Multicache on Ibiza.
This one leads you on a beautiful trail into the northeastern hills of Ibiza. You'll need about 1-1.5h to find the cache and return, depending on your walking speed and the time you need to find the cache.

ATTENTION: You need a compass to find this cache!

How to find it:

First of all, you'll have to drive towards the given position for parking.On your way there, you will drive on a road which has a specified number which can be seen on the milestone signs. Regarding the direction, from which you reach the parking place,you will use different roads. But the numbers, which are needed, are the same for both directions.
A roadnumber looks like this: PM-123
You will need the following numbers: PM-CDX
C and D are the same for both roads, X doesn't matter. If you haven't seen a milestone-sign on your way or want to verify it, you can go direction "Cala de St Vicent" for a short while to find one.
The sum of the digits is 9 for the one road and 10 for the other. On your parkingplace, there are little pillars made of cement. You can see them following the road in western direction, the distance between them is low, so if you can't find one, because somebody mowed it with his car, just follow the road in western direction to find another one.
On these pillars, there is something written, a long word and a short one. Count the number of characters of the words. The number of the short word will give you E and the longer one will give you F.
For example: The pillar has four sides. Opened it would look like this:

T h e O n e

T h e O t h e r

T h e O n e

T h e O t h e r

So "TheOne" would be the shorter word, so E would be 6 and conclusive F would be 8.

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Now you can start your walk into the hills. Pay attention at the given waypoints to not take the wrong direction.
On your way up the hill, you will have a great view towards the island "Tagomago". If you imagine a direct line between your position and the island, you can see little rocks in the water. The number of the rocks you counted will be A. You can divide C by A without a remainder!
Don't count the shallowbank! Only clearly visible rocks.

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Now you can calculate the position of the first stage:
N 39° E.0(C)(C+D)‘
E 1° (A+1)E.(F+2)C(E+F)‘

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When you've reached the point, take out your compass.
The direction in degrees, where you will find the cache is:
(C-F)DF°
Follow this course until you find a tree shaped like the one below. Behind this tree you'll find the cache. Please try to not leave big traces in the needles.

                                                                                              
                                                                                              
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Additional Waypoints     

Lookup	Name	Coordinate
A0	Parking Area (Parking Area)	N 39° 03.714 E 001° 35.058
Note:		Possible Parking area, some shady places, but far away from next housings.
T0	Trail0 (Trailhead)	N 39° 03.728 E 001° 35.056
Note:		Entrance Point to the trail.
T1	Trail1 (Trailhead)	N 39° 03.736 E 001° 34.970
Note:		At this point, follow the trail north-west-wards.
T2	Trail2 (Trailhead)	N 39° 03.816 E 001° 34.884
Note:		Follow the west-leading path, ignore the southern one.
S0	Stage0 (Stages of a Multicache)	???
Note:		First and only stage of the cache. Position has to be calculated as described in the text.
C0	Cache (Final Location)	???
Note:		Cache Location. Details in the text.