Navigational system
From the earlier work I came to the conclusion that there was a high probability of a viable navigation system covering the whole of this area and quite possibly a much wider area. The system could then have been used to produce maps using the myriad of points created by the pentacles themselves and the alignment lines running in every direction. To create maps, however, the measurements of the pentacles would have to be known.
Fibonacci Proportions

What is always true is that the dimensions are still related to the golden number. Thus in this diagram A/B is always 1.618(….)even though the individual lengths may not be Fibonacci numbers.

Using the numbers 34,55,89,144,233,etc will make it possible to predict the size of other components.
All the main dimensions will be numbers from the Fibonacci Sequence.
Trigonometry




However unlike triangulation, surveyors in the field would not have to work out these dimensions in the way shown here , they could be read from tables. These calculations only had to be performed once as all the pentacles are specifically constructed to be identical. Here for comparison is another look at the preliminary notes made by Cassini, showing the enormous variation in the measurements and triangles he was using.
Lacework

Wouldn’t it be wonderful if there was a unit of measurement which gave a match for these higher fibonacci numbers and could be used to construct pentacles “on the ground”
Centimilles

Now I concentrated on Kilometres and took the very first measurement across the side of a pentacle. It is displayed as a yellow measurement lineof value 6.11 Kilometers * 0.6172 =3.77 miles =377 Centi-milles. 377 is a Fibonacci number and sufficiently large for the golden number relationships to apply.
Why is the Conversion number not a perfect golden number? it is all to do with the use of decimal places. I believe it is the 6.11 measurement which is slightly wrong not the centi-milles.
Predictablity

The numbers are high enough in the series for the relationship to be valid. 3.78 Kilomenters * 0.6172 = 233 centi-miles

Conversions

In this case 1.44 converts to 89 Centi-Milles.

If the metric distances had been measured in Centi-Kilometers (a unit of 10 meters) then the metric measurements would also be Fibonnaci numbers but always on higher in the series that the cent-mille equivalent!

All the distances in alignments, calculated at the bottom of the navigation construction page, apply to all the alignment lines running in every direct without any further conversion.
Nesting Pentacles

In this case 2.33 kilometres is the side of the middle sized pentacle, is the same as the side of one of the points of the larger pentacle of value 144.

Every dimension is predictable.

Therefore key dimensions of the smallest pentacle should also be Fibonacci numbers or should they?

System Breakdown

Conclusion
I find all this interesting and surprising. It means that it is possible that there was a viable navigation system which could be used to draw maps on which the location of the treasure could be marked. Alternatively the system of pentacles itself could be used to locate the hiding place. This second method could be codified and without a knowledge of how the navigation system works be difficult to penetrate. But does any of this give us a clear idea of where the treasure is or might be? No! emphatically not!