Originally Posted by av8or
I agree with some of the others who have already replied to this thread. Get yourself an inexpensive GPS unit like the Garmin 12. You will quickly find that it can be an invaluable tool that will give you an accurate altitude in MSL, but also gives you lots of other useful info as well.
Randy
But, aren't GPS units:
1) bulky (when compared to other alternatives)
2) not good for recording "cumulative elevation gain"
3) battery inefficient (would the batteries last on a typical century ride?)
4) subject to satellite drop-outs due to trees, mountains, etc.
I have a handheld GPS, but don't take it on rides for these reasons. But, it's a couple of years old, so maybe some of these issues have been resolved?