@Greenham

Shaping points (soft points) can be skipped without the Garmin sending you back to a skipped shaping point.
You must visit via points (hard points) or skip them manually.
Only start a route if you:
Have a connection with at least 3 satellites,
Are on the route or are close to the route.
Never start a route in the garage or at the kitchen table, because then the Zumo has to calculate to your starting point.
Again, use a maximum of 28 via points and place them at critical points or where you want to stop. For the rest, just use shaping points. I myself use a maximum of 7 via points in my route and form the route with sufficient shaping points.