Very good and clear responses. Thanks yet again.
Valid point re. Europe and airports all round. I guess I was talking about distance rather than geographical location.
I guess my absolutely final question would refer to my RTE2 page question but involves the ETP:
Would you constantly update RTE2 as you go on so that it is related in some way to an ETP? Further, can you update an ETP from a new airfield en-route?
I imagine London to Hong Kong or some such - or Japan to New Zeland/Buenos Aires/Rio kind of flights). Could you 'reset' your ETP (along with a revised RTE2 page) on passing a possible en-route alternate and consider that your new 'base' or 'imaginary departure airfield' for want of a better word?
I hope I make myself clear.
Dan