If I'm not mistaken, the garmin watches automatically take elevation into account. You can track your elevation change as you ran on the website afterwards.
I have an old garmin 210. The distance of my usual runs is the same every single time. All the races I've run have been accurate within a few hundred meters (ie over a half marathon). The only problem with this old watch is once in awhile it will drop GPS. It's also super annoying to connect to a computer (the cable connection takes several tries every damn time)
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ech·o cham·ber
/ˈekō ˌCHāmbər/
noun
An environment in which a person encounters only beliefs or opinions that coincide with their own, so that their existing views are reinforced and alternative ideas are not considered.
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