OK, I understand now. I find that while I use grouped closest subject priority AFC - (this is not the default - default in group AFC is dynamic focus tracking) I quite often switch to single point AF when I see from the subject that closest focus is not gonna work.
I use the switch on the back of the subal to do this pretty regularly - and it is very conveniently placed to do so (as it will be on other brands of housing too).
The AF system on the D2X is different from the F100 and D100/D70 I have been shooting previously. And certainly there is an adjustment to make as a photographer. I would never have used a closest subject priority on the D100!
I realise that my examples are not directly comparable - i have a bit of thing at the moment of trying to isolate subjects against clean blue water!
Looking forward to seeing more of your W Australia shots.
Alex