GPS Bike Computer Hammerhead Karoo 2 Vs Map & Compass

Hammerhead asked us to set us a cycling challenge to show off their new Karoo 2 GPS bike computer, so we made Alex race against Ollie, but in order to make it fair we gave Alex a map, and Ollie the Hammerhead Karoo 2 bicycle computer. Now we’re pretty sure which is the best way to navigate on a bike ride, but are our presenters up to the challenge?