Re: Why is GPS off?

Posted by buickanddeere on November 07, 2004 at 13:51:12 from (216.183.136.3):

In Reply to: Why is GPS off? posted by Farmer in the Dells (WI) on November 07, 2004 at 08:35:53:

Three satellites will give position and four or more will calculate your elevation as well.
For surveying or controlling equipment travel there is a 1st and 2nd generation correction system. A known way point is found and a correcting signal is broadcast to the mobile GPS unit to correct the error. If memeory serves the 1st generation system is good for +/- four inches.
There was an article in the Deere publication "Furrow" this year that explained GPS rather well.
Makes it tough to do surveys as maps often show a straight road while you are standing on the curve caused by a surveyors error 100-200+ years ago.
The random error was cut from 100ft to I think 30 ft or so?

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