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Thread: When not to trust a GPSr

  1. #1
    dí76 Guest

    Default When not to trust a GPSr

    This has become an ongoing problem with my GPSr. What do you folks think?

    All to often I try to find the exact location before I start looking. When I find the location Girlmate has usually already found the cache. When I look at the accuracy of the GPSr it can be usually +/- 20 ft. frequently it is more than a 40 ft radius that the cache is in. I have A Garmin 60c. I wonder if the problem is the operator, Any quick fixes that you suggest and Yes the WAAS is on.

    Dave

  2. #2
    Join Date
    Jul 2004
    Location
    Fairfield, Maine
    Posts
    3

    Default

    Give Girlmate the GPSr

  3. #3
    dí76 Guest

    Default

    Technology stuff and Girls???? I don't know. It might be to complicated

  4. #4
    Join Date
    Jun 2004
    Location
    Solon, Maine
    Posts
    5,940

    Default

    Quote Originally Posted by dave1976
    Technology stuff and Girls???? I don't know. It might be to complicated
    I agree with Dave1976. The only time RULOST2? gets to hold the GPS is when I need to wander off to water a bush.

    But I have a new GPSMap 60c, and have had results anywhere from DEAd ON to 30 feet away. It just depends on tree cover, etc.
    Last edited by WhereRWe?; 05-09-2005 at 01:26 PM.

  5. #5
    Join Date
    Jun 2004
    Location
    Augusta, Maine
    Posts
    119

    Default

    Quote Originally Posted by dave1976
    Technology stuff and Girls???? I don't know. It might be to complicated
    HEY!! Don't make me come over there!!

  6. #6
    Join Date
    Jun 2004
    Location
    Litchfield, Maine
    Posts
    3,589

    Default

    Here is my ideas on this. The coordinates are only as accurate as the GPS of the person that placed the cache. If he did not get a good set of coordinates then you GPS may be reading right where his might have been wrong or vise versa.

    If you have a 60C which is suppose to be a good GPS then maybe the person that placed the cache had a crappy GPS and did not get accurate coordinates.
    Blazing Troll

  7. #7
    Join Date
    Feb 2005
    Location
    Winslow, Maine
    Posts
    22

    Default

    Of course another alternative once the cache is found is to determine your own coordinates, post information on the geocaching.com site log, invite coroboration, and then come to a consensus as to whether the lats/longs. were correct in the first place or whether your GPS is inaccurate.
    Nuffer

  8. #8
    Join Date
    Jun 2004
    Location
    Solon, Maine
    Posts
    5,940

    Default

    Quote Originally Posted by attroll
    Here is my ideas on this. The coordinates are only as accurate as the GPS of the person that placed the cache. If he did not get a good set of coordinates then you GPS may be reading right where his might have been wrong or vise versa.

    If you have a 60C which is suppose to be a good GPS then maybe the person that placed the cache had a crappy GPS and did not get accurate coordinates.
    Good point, and since we've got the new GPS, we've taken both the new and the old out a couple of times and they NEVER agree to within 20 feet.

  9. #9
    Join Date
    Jun 2004
    Location
    Bangor, ME
    Posts
    6,061

    Default

    I usually try to watch both the GPS and for likely locations about 100 feet before I arrive to a cache site.

    If the cache is often more than 40 feet away when you have 20 foot accuracy, something can't be right. We have a few caches with poor coords, but for the most part they are not bad, definitely not 40+ feet bad. I don't even have WAAS and I'm much less than 40 feet more often than not.

    Is the datum set right, WGS84? (I would assume it is the default)

    If your GPS supports averaging, maybe it's hasn't caught up to you get. I know some Magellan's have this problem, I have heard some slow down when they get about 100 feet away and let the GPS settle so they don't overshoot the area.

    We should set up a few areas in the state where reception is good where people can set there GPSr and compare coords. Like on the bird bath at Thomas Hill Standpipe.... Or the first stage of Stacked On StillWater....or maybe we're just better off with the standpipe.

  10. #10
    Join Date
    Jun 2004
    Location
    Brewer,ME
    Posts
    2,576

    Default Stacked Accurate

    HA HA
    Happy Trails!
    Yeah it's a Jeep thing!


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