surveyors use survey grade DGPS with accuracy only a few inches. i
want to know the models under a $5000 price (I have already found a
$4000 TRIMBLE, but it is not easy to use)

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Request for Question Clarification by kyrie26-ga on 16 Nov 2002 08:51 PST

cachalot-ga,

Are the comments provided by denco-ga and koz-ga sufficient, or would
you like a researcher to work on this to provide a more thorough
answer? Thanks.

kyrie26-ga

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Clarification of Question by cachalot-ga on 16 Nov 2002 10:41 PST

denco-ga had a satisfactory answer, and should get the fee. 
kozga did not because a systems needs two units, one base and one receiver

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Request for Question Clarification by koz-ga on 16 Nov 2002 10:47 PST

Sorry about that.  Prairie Geomatics
(http://www.prairie.mb.ca/price_csi.htm) carries the necessary CDA-2
antenna for US$600.  That still puts you under the $5,000 mark.

It appears it gets down to Trimble, Ashtech and Corvallis
for the "mid-range" but accurate GPS units...

http://www.cmtinc.com/nav/frprod.html

has a variety of systems, but it will have to be a post
processing solution before you can attain the accuracy
you are looking for within the sub-$5000 price range.

Corvallis has:

MARCH II-E 3.7 PKG - List Price: $4,385.00
MC-GPS 3.7 PKG - List Price: $5,650.00

Both of the above are with their beacon receiver package
and are $1200 cheaper if bought without it.

Here's another that I have found:

http://www.navtechgps.com/supply/dgpsmax.asp

$3,350, accuracy of "better than one inch at rates up to 5Hz"

Good one Koz!  Just plain missed that one...