A way to tell if you're late

Here's the thing: unlike what computers like to believe, we don't travel from A to B exactly as they planned it.

We stop for coffee. We meet a friend. We take detours. We shop.

And then time slips away.

So, there's that blue dot on your map. That's you. What if there were a red dot as well? One that arrives on time. If you see the red dot is in front of you on the route, well, then you should run. If it's behind you, you can grab a coffee.