> Has any one done any thing with Differential Global Positioning System.  
> I was told it can improve GPS accuracy to 1' or less.
>
> But then in the world of  Deg., Minutes and seconds how long is a
> Tenth of a second in Feet or meters?

One minute is one nautical mile at the equator (definition).

So 1/10 of a second of arc would be roughly 10 feet
(6075 ft/min  /  60 sec/min  /  10).
						Lee Jones

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