LMNH: "Look mum, no hands!" - Cycle café/bar/workshop on Old Street

what's wrong with just putting your garmin on your stem? Assuming you've figured out how to use it, Iain.
I can download routes, but im still at a loss as to how to turn on the warning sounds/ arrows. Plus im sure theres lots of cool things you can do on it but I have no clue.

Basically, no I havent.

Someone teach me?