Go button not appearing on routes created in Basecamp

Hi everyone, I'm just starting to learn how to use a GPS and I've uploaded a few routes created in Basecamp onto my Garmin Etrex 32x. The routes (and the waypoints) are visible in the route planner and they load properly onto the map, but there is no GO button for engaging turn by turn routing.

I've noticed that this happens only with routes created in Basecamp. If I create a route on the Etrex 32 itself, then I get a GO button when I choose the route.

I have a feeling there must be something obvious that I'm doing wrong, or a setting that needs to be changed in Basecamp.

I would appreciate any help on this, as I would like to be able to plan routes on the PC beforehand.