Display speed without starting activity tracking

Hi, is there an easy way to display speed without starting activity tracking? 

Often I am just on a short bike-ride or run and just want to have a quick glance on my speed. However, it seems none of the widgets really has an option to display speed. If I want to see my current speed I need to enter an activity. Not impossible, but clumsy. Also the GPS interface shows just the coordinates and not speed. 

Basically, what I am looking for is a watch face or widget that can show current speed. 

Anybody has an idea if that's possible? 

Thanks 

R