Works with Endomondo. Using GPS from the phone, but I am inside so the reception was not very good:
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You can start/stop your workouts on the watch with the big button, but everything is actually logged on the App on your phone. I think you might be able to use the watch GPS, but the phone GPS is really accurate even when in a pocket from my experience.
Also connected my Garmin HRM-RUN Ant+ chest belt to the Endomondo app on my Samsung phone. Was done in 10 seconds and I have results below:
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As you see I was not really that surprised it worked.
Fun fact: cost me a total of 5 calories to test this.
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