The best replacement for garmin 510 is sigma rox 10.0.

The best alternatives to garmin 510 are rated as following:
★★★★★  sigma rox 10.0
★★  bryton

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Speaking about garmin 510, one probably shouldn't forget about strava.

Other search terms related to garmin 510 and their ratings are:
★★★★★ strava
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garmin 510
sigma rox 10.0
bryton