On Thu, 2005-12-08 at 15:11 +0000, Joe McCauley wrote:
> Certainly many OEM GPS modules are DGPS ready. This means that there is a
> fixed location broadcasting the correction info as has been said. This info
> is received by the end user using a radio reciever tuned to the DGPS station
> and the correction info input to the GPS module. As far as I remember (it's
> been a while since I looked at this) you are supposed to use the nearest
> DGPS station to you for best accuracy. 

FWIW, the reason DGPS can be so helpful is local variations in the
atmosphere, which is why they recommend using the closest station. These
variations cannot be predicted, so it has nothing to do with how
"affordable" a receiver is. TTYL

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