--- In 
BoundaryPoint@yahoogroups.com, "m06079" <barbaria_longa@h...> 
wrote:
 > & maybe we can even figure out why this otherwise perfectly 
> meridional arcl boundary appears to lurch so at marker xxv
 
I don't know, but XXVI seems to be in dispute, or was in dispute, 
acc. to 
http://www.unrc.edu.ar/hielos/hist_n.htm ("Los 24 puntos sin 
demarcación son: (...) Hito en la orilla norte del Canal de Beagle 
(Pcia. de Tierra del Fuego)") (how a marker can be not marked puzzles 
me a bit though...).
BTW, the mixed boundary commission is known as COMIX... :-))
The ARCL border isn't that straight on Tierra del Fuego: note the 
deviation at hito XI at 
http://www.tierradelfuego.org.ar/planeamiento/M1.htm .
I suspect it's the same story as with CAUS: after demarcation, the 
border is fixed, even if it deviates from the border definition of 
the treaty.
Peter S.