Help with Geocaching Triangulation problem  what is the best calc for this?  Printable Version + HP Forums (https://archived.hpcalc.org/museumforum) + Forum: HP Museum Forums (https://archived.hpcalc.org/museumforum/forum1.html) + Forum: Old HP Forum Archives (https://archived.hpcalc.org/museumforum/forum2.html) + Thread: Help with Geocaching Triangulation problem  what is the best calc for this? (/thread26797.html) 
Help with Geocaching Triangulation problem  what is the best calc for this?  Mark Gessner  01262003 A Geocaching triangulation problem: Given three pairs of lat/lon coordinates, and a distance from each, find a third pair of unknown lat/lon coordinates. Figured out how to do this by construction using a map and some dividers, but it seems that there must be a better way to do it by HP calculator. Which calculator would be ideal for this? My wife grabbed her TI83 and said it was best, but I maintain that one of my old HPs must be better. Problem is, I have so many of the damned things I can't choose which is best to solve the problem. See what you think: http://www.geocaching.com/seek/cache_details.aspx?ID=20947&log=y&decrypt=y
mark.
Re: Help with Geocaching Triangulation problem  what is the best calc for this?  Vieira, Luiz C. (Brazil)  01262003 Hi; I once dealt with a subject closer to this: given (M1) coordinates and the expected area that define a Mcoordinates polygon (a surface area), find the M_{th} coordinate (the "unknown" side could shift or rotate). I have the basic knowledge for surveying (I was a regular student at the surveying classes when I was at the university) so it was not too difficult to achieve a procedure. My solution used a 2unknown system and the matrices resources available with the calculator. Unfortunately, the final program does not belong to me and I will not disclose the listing. Anyway, the method I used to compute the unknown coordinate was developed by myself. I used an HP48G at the time, but depending on how deep you want to go to solve the problem, any of these calculators can be used:
HP15C I do not know the HP39G and the HP40G, but I believe they can also be used. Even other calculators that do not have "resident" resources may be programmed to do so; the ones mentioned above may directly deal with matrices and complex numbers, if needed, without the needing of specific programs. If you need more details and specific support, email me.
Best regards.
