WAAS does not require any additional equipment on the GPS, if it is a
WAAS-enabled unit. It DOES require that the satellite(s) transmitting the
WAAS signals be visible to the GPS. I use my GPS76 on Lake Ontario, and it
has no problems getting the WAAS signal.

At 11:21 AM 4/21/2003 -0400, you wrote:
>Standard resolution for commercial GPS is 15m, regardless of what
>advertising tries to sell.
>
>WAAS, as stated can get to 3m, but this involves additional (costly)
>equipment. A WAAS enabled unit will not get you any gains on it's own.
>
>Thales (France Aerospace giant) just released a claim that the have a new
>correction service that implements a correction algorithm that almost
>guarantees 10 cm resolution.
>
>My commercial unit, I would guess does get my boat to within 15m or better
>every time.
>
>How much res do you really need?
>
>CL
> >
> > What is the most accurate GPS available these days?  That's with out
> > using extra equipment.  If one were to use extra equipment for finer
> >  resolution what is the cost and resolution available?  I want to be
> > able to return to the same spot on the water repeatedly.
>
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Larry Bradley
Orleans (Ottawa), Ontario, CANADA

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