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Why is GPS off?
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Posted by Farmer in the Dells (WI) on November 07, 2004 at 08:35:53 from (66.187.42.88):
Ed, Leland or anyone else,
I believe GPS can be off depending on the type. Correct me if I am wrong, but the bottom line is some earlier units that reference on three points have no idea which side of the pinpoint you are on. Therefore once they reference on the third point, it triangulates and creates a mirror image of the points. Because it does so using a calculated circle, you have two possible locations. In short, put three dots on a paper in the shape of a triangle. From those dots draw a circle large enough to overlap the other two. Your triangulation now shows two possible locations. The older three point GPS do not how to distinguish between which locations. I believe the newer units don't reference until they see a fourth satellite so drawing a fourth circle clears the confusion for the location. I have referenced as many as 7 satellites at one time. I have no way of knowing how many of those the unit used for its location though. The navigators found in many vehicles today are more advanced and can pinpoint locations right down to a street for left and right turns. The location equipment like earlier Onstar� or Lojack� programming may not have to be that advanced. If you get 10 feet from the location to find the vehicle, well, enough said. I have used mine for fishing on larger bodies of water and it seems to pinpoint accurate enough to find a shelf or a rock formation. If anyone knows more, chime in I will see if I can find my printed data on this to post.
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