Paul,
So how come my navigator has to reference multiple satellites to achieve the same effect?
This is what I mean - people can propose a mechanism without actually building a device, or even really proving that it would work. This is the same kind of explanation as the dying neuron theory of NDE's.
Obviously if RS could turn his morphic field on and off at will, that would be great - but just because he can't, doesn't prove the idea is worthless. Please remember that Rupert did not come to his ideas out of the blue while working as a postman - read his biography:
About Rupert Sheldrake - Biography
I am sure he realises that his morphic field is a very tentative concept, but I suspect that it gets closer to the truth than many extremely far fetched 'conventional' explanations.
David