Each country have its own Datum and works with its own set of proyections.

GPS, Google Earth and many other "modern" applications use WGS84 as the
datum/proyection.

One can have tens of metres diference when switching from one set
of datum/proyection to another

Therefore the correct way of giving a set of coordinates should indicate the
Datum/Proyection as well as LAT and LONG.

I use for international comunication and for avoiding errors - the
mainstream WGS84.

WGS84 Lat -39.1  /  Long -72.65


-- 
Juanse Barros J.
APIZUR S.A.
Carrera 695
Gorbea - CHILE
+56-45-271693
08-3613310
http://apiaraucania.blogspot.com/
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