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    Re: Unwarranted levels of precision
    From: Paul Hirose
    Date: 2017 Dec 20, 16:44 -0800

    When the fire department in my area calls for an air ambulance, they
    give the coordinates of the landing spot to .001 arc minute. Sometimes
    the units on scene are too busy to take a GPS fix, so the dispatcher
    gives the copter "approximate" coordinates in degrees, minutes, and
    seconds to 4 decimal places. I believe they are reading that off a GIS
    at the dispatch center.
    
    But the biggest case of precision overkill I have ever heard was a
    transmission to a Los Angeles County Sheriff helicopter searching for a
    missing hiker. A cell phone company provided lat/lon which was relayed
    to the copter in decimal degree format with 14 decimal places. Then the
    copter read back all the digits for confirmation. The only comment was,
    "those are the most specific coordinates I've ever seen."
    
    

       
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