@steve-lynch I think that’s the key thing to ensure is done - to have the regional map(s) you need for a trip or tour installed. These days, it’s relatively rare that neither a suitable phone signal nor a wifi hot spot can be accessed for the few moments required to open a route in Navigation. Not an infallible system, but I have managed just fine so far.
I don’t know about the technicalities of it, but I wonder whether, at some point, it might be possible to introduce an option to install routes onto a device in a manner similar to installing offline maps? Then the need for internet ‘in the field’ could be largely negated. This could be a really helpful addition to the Route Planner / Navigation combination, particularly following a flat battery or device issue that meant navigation was interrupted en route.