Thanks for all of the thought provoking replies to my question.
As I reflected further on this, I realised, with the 20-20 vision which hindsight provides, that I personally would have preferred to have completed enough navigation training before undertaking my first solo to enable me to undertake any necessary diversion with some level of confidence and not as the gritted teeth and sweaty palms ordeal which it otherwise would have been!
As someone said in their post, it's all about risk management and given that the incidence rate of my "doomsday" scenario is very low, perhaps the aforementioned hindsight is making me over cautious after the event!
