SETTINGS/GENERAL - Off-route recalculation

Off-Route Recalculation should normally be set to automatic

You only disable it when, in the map screen, you are planning a route that does not start where you are physically located.

When set to automatic, your planned starting point will be over-ridden as soon as your SL350F has satellite connection (whenever you have satellite connection, your gps always uses your current position as the starting point in any journey).

If you disable it, don't forget to turn it on again before you hit the road.

Now use the arrow in the top lh corner to return to settings.