Rainman - while your math may be correct, your science is not. With today's MWD technology (measurement while drilling) and downhole steerable mud motors, they can very accurately determine where the bit is at in relation to the surface entry point.
It's also a requirement in the U.S. and I assume in Israel also, that any deviated well runs a directional survey after TD, it can be a wireline based tool or other means.
If you give a good drilling crew a fossil target to hit at a certain x,y,z downhole location, they will hit it.
If they didn't drill deep enough, its not because they lost track of where the bit stopped.
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