Steve
gpx 1.1 Route with shaping points (balls) and viapoints (Flags)
You can leave the recalculation on on the Zumo XT, if you deviate from the route you will be brought back to the route (to the nearest ball or flag)
gpx1.1_Zumo.jpg
gpx 1.2 Route-Track via viapoints (Flags)
You must turn off the recalculation on the Zumo XT, if you deviate from the route you will have to drive back to the route on sight. If you leave recalculation on you will be directed to the next flag according to the settings on the Zumo.
gpx12_nav6.jpg