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  • Database Analyst Washington Univ. School Medicine

    I'm consulting for the Lineberger Comprehensive Cancer Center at UNC Chapel Hill. We are looking to augment our automated geocoding for a breast cancer study in Beaufort, Bertie, Martin, Washington and Tyrrell counties, but especially Beaufort. We have a volunteer with a handheld GPS unit who is willing to do some legwork, but our first test, her house, was off by .4 mile from the results from a national geocoding firm (TeleAtlas). She say's the GPS coverage is poor in her area. I'm getting my information second-hand, do you know what she might be talking about or have any tips for recording locations in this area (time of day maybe)?
    Jim Struthers
    Division of Health Behavior Research
    Washington University School of Medicine
    4444 Forest Park Avenue
    St. Louis, MO 63108-2212
    (314) 286-1942 FAX: (314) 286-1919
    The reason for her .4 mile inaccuracy is due to the governments scramble of the incoming GPS signal. This is security reasons. A differential beacon can be attached to some GPS units to enhance there position accuracy. This is done from satellites and land based signals. Some newer GPS units have these and also look for wide area augmetation feature on some units. It is her GPS unit.