This article will explain the different colored routes that you will see on your Karoo.
The Route will be shown in Red when you are riding a saved route.
It will stay Red as long as you stay on-route.
This is the routing engine. It follows the Red (Planned route) unless if you go off-Route, then a shortest path to join the planned Route will be created in Blue.
This will also happen if you start a ride away from the start point of the route.