In this video I try to describe how I set up the Koso D55 using their GPS speedo unit. Simpler than it looks as the instructions are written in Chinglish.
Normally these units use a couple of magnets on the front wheel and a hall sensor to work out your road speed, I want to move away from having all that gubbins so lets give this GPS thing a go...
I'll only be bale to fully test it once I can get it legally on the road but it seems to be working.