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## Re: Accuracy of radio/GPS-like system?

 Subject: Re: Accuracy of radio/GPS-like system? "Richard" Mon, 10 Oct 2005 18:00:25 -0400 sci.electronics.basics
 ```"Wildepad" wrote in message > Sigh! The angle is the really important part -- position is > meaningless unless the exact direction is included. If you know the position (lat/lon) of the fixed location and of the point you are located, you can compute the angle. 1. Determine delta lat and delta lon between the two points (it helps to read latitude and longitude as decimals, or convert them to decimals) 2. Find atan(delta lat/delta lon) to get the angle from the fixed point. If using Excel, this will be the angle in radians, so convert to degrees by multiplying by 180/pi. Making a triangle, delta lat is the y-axis distance from the fixed point to the new location; delta lon is the y-axis difference. Thus, you can see that Pythagoras comes to aid once again. I hope this helps (and that my trig is still accurate). Richard ```
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