I'd turned it on, just went out for a run though and it didn't pick up at all. When the running app is on you get the small logo to show if you're connected to GPS (flashes if you're not). Problem is you don't get it when you're waiting to start or paused, so you have to stand there waiting for it to lock or run and not track. ****ty bit of design and completely impractical for timing races or anything.
I can now get it to lock when sat at home connected to my phone, will have another go tomorrow.