meic wrote:IMHO the extra features of the 30 model are not worth the extra.
This is more likely to be true than not. However there are requirements for measuring altitude with a barometric altimeter for certain parts of the Audax experience.
So any Audaxer with an interest in chasing AAA points will want the 30 model.
Or if they dont fancy coping with a wet touch screen an older Vista HCx.
There is a possible drawback with the Vista that it doesnt use .tcx files. I am not bothered by it as I am happy enough just to follow tracks but I can imagine it being of benefit if a GPS did.
Do the 20 and 30 use .tcx's?
The eTrex 20 does a pretty decent job not only of telling you the altitude at any given moment, but also producing altitude profiles and statistics:
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(the graph scales are adjustable - so this isn't the best example, but one I had to hand.
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so unless you are required by the regulations to use a barometric altimeter, the eTrex 230 will do the job just as well.
The later eTrexes work with a joystick rather than touchscreen - the joystick isn't wonderful, but it copes fine with the rain.
On the subject of rain, I don't know whether Garmin have cracked the problem of water on touchscreens, but my iPod touch really doesn't cope with rain - and I imagine smartphones have the same problem.
SFAIK the newer eTrexes don't support .tcx - you have to get an 800 etc. .tcx files are .gpx files but with the addition of data on heart rate, cadence etc - this is useful if you want to analyse this information on your computer, but doesn't contribute anything to navigation. (It may also include things like split times which might be useful for racing - I don't know).