Just curious, how are you intending to use elevation data?Does it record elevation? Are you able to test this out on your next run please?
Generally speaking I've found GPS elevation information on GPS watches to be pretty bad. Nature of the beast due to the physics/geometry involved. Typically companies like Garmin or Strava or even RunKeeper use third party GIS data sources to correct the elevation info once your workout is uploaded to their servers. SO you end up with the elevation info after the fact. Even with the current NRC watch app, even though Nike doesn't show any elevation data it's available once the run is copied over to Garmin Connect or to Strava, so it's not been an issue at all for me.
Where better elevation accuracy is needed you'll find watches get it from a barometric altimeter. I don't know if any apps have access to that component that is apparently in the AW.
Also a good read: https://www.dcrainmaker.com/2010/05/understanding-sport-device-gps.html
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