MMR uses GPS and it is very accurate. I have checked it against Google Maps ( by going to the old Google Maps on the web and plotting out the distance for a route) and other GPS enabled apps. Calories burned is also quite accurate
I got a response from map my run developers to my review i made. You can see it in the screenshot.
I suspected something like this.
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Where are you finding this app? Maybe it isn't avail in Canada, because its not coming up in my samsung gear apps store I just have the factory exercise apps, and I don't think they are correct. When I'm on the treadmill, I do an interval run, walk one run one for about a half hr and it says I only burned about 85calories