I couldnt get it to work either! Following the video guide, I am pretty sure my settings were correct but very difficult to the the software to 'settle' down to give me the time results.
I used my ETA based watch which is considerably loud in a room without air con or fan but still couldnt work.
I too was hoping for some guidance from other forummers

I will try the new app Watch Accuracy soon... hope this will give me better results.
