To all my treasure hunt'n buds. Remember what Old Dog would say about keep'n on digg'n.
Well, here is a high quality map of New Spain:
Map of New Spain
And here, is an excellent research book on all things (Found this by reading what the peers have left us among the sacred Tnet thread 10-4)
http://net.lib.byu.edu/fslab/researchoutlines/Europe/Spain.pdf
Vara of Burgos:
http://www.emis.de/journals/ZDM/zdm992a3.pdf
Units of length:
http://www.2iceshs.cyfronet.pl/2ICESHS_Proceedings/Chapter_16/R-8_Navarro_Merino.pdf
And this link breaks down how they did some stuff:
http://missiontour.org/related/measurements.htm
Some more stuff, very interesting:
http://www.numericana.com/answer/ancient.htm
Read this lil bit from the last link:
Officially, each flavor of the land league remained quite stable over time, although actual recorded measurements may show some lack of precision for both local land surveying and itinerary measurement. Among the many "leagues" born in the Old World, Roland Chardon singles out 5 which took hold in North America:
French lieue commune of 3 Roman miles (4444 m).
French grande lieue ordinaire (3000 pas = 4872.609 m).
French lieue de poste (2000 toises = 3898.0872 m).
Mexican league, legua legal
(3000 pasos de Solomon = 5000 varas = 4191 m)
Castilian legua común, legua regular antigua, modern legua
(20000 pies de Burgos = 5572.7 m)
The Spanish system comes in different flavors whose basic units differ slightly, but all of them have 5 pies to the paso and 3 pies to the vara. The vara may also be subdivided into 4 cuartas or 8 ochavas. The vara de Burgos was apparently first established in 1589, but was given its final metric definition (0.835905 m) only in 1852, as Spain was converting to the metric system. It competes with the vara of California (now identified with the ancient vara de Solomon) which the Treaty of Guadalupe Hidalgo (1848) set to 33 inches (0.8382 m) to replace no fewer than 22 variants previously flourishing in California... The so-called "vara of Texas" was defined in 1855 (3 of those are exactly 100 inches).
So, as you can see in that last paragraph 33 inches was not officially set until 1848, which opens a whole nother can of worms. But, by the Ancient vara de Solomon, who is to say what system of measurement was being used.
And to truly understand the history of the League, no debate, but you must read:
http://en.wikipedia.org/wiki/League_(unit) "Spanish geographical league" might be the more prevalent system used, although, sailors may have used an combination of similar systems. But, after the abolished system, the newer league was more than obviously used by the King in Royal measurement.
Finally, here is a link to the Spanish Customary units:
http://en.wikipedia.org/wiki/Spanish_customary_units