sorry for the noob Q, new to this kind of gps'es.
AFAIK the "main" difference between the 2 is that the 30 has a triaxial electronic compass and barometric altimeter.
I'm not really interested in using this with maps as an electronic compass or the have correct altimeter readings.
One thing i could not find out by searching around is if having triaxial electronic compass (and barometric altimeter?) does make any significant difference in the accuracy of the device?
I assume the compass reading is also used for navigating, but is the difference really significant? is the 30 then faster to show you the correct heading or so? and if so, how much of difference does this make (compared to the 20)?
If i missed a faq where this is explained in big fat letters, then a link would be welcome
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