1

The LTE version of the Apple Watch Series 3 is not available in my country. Can I use the non-cellular version of the watch for tracking my runs while leaving my phone at home? Would this compromise the accuracy of the tracking?

I know that the watch has GPS, but how would it affect the apps if there is no data connectivity while tracking?

2

Can I use the non-cellular version of the watch for tracking my runs while leaving my phone at home?

Yes. The Apple Watch Series 2 doesn't need to be paired to an iPhone to utilize GPS tracking because it's built in.

From a MacWorld article on the AWS2 and the GPS functionality:

...loved how the Series 2 and iPhone intelligently passed off route tracking duties. “Apple Watch just seems to know when it’s out of communication distance from its paired iPhone, and it gets a GPS signal without you telling it to. And if I do have my phone with me, the Workout app will let the iPhone do the GPS because it’s the bigger-batteried device.”

And from Runners World on the GPS functionality and the accuracy:

The biggest update for the Apple Watch 2 is a new focus on fitness and the integration of GPS into the watch itself. The first version off-loaded that work to your phone, but not all runners like to carry a phone when working out. Now they don’t have to. In our testing, we’ve found the GPS accuracy to be on par with our sport-specific watches

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