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Strange accuracy issue

 
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WestSideDaddy
Past MnGCA Board


Joined: 06 Apr 2010

Posts: 559

PostPosted: Fri Sep 02, 2011 8:16 am    Post subject: Strange accuracy issue Reply with quote

So, on the way to work today I found a cache-less park (unless there was a puzzle final) and decided try hiding a nano I bought this spring.

So I used my Oregon 450 to mark a single way point.

Despite the unit showing good accuracy, it showed that the way point I just took was 47 feet away (I hadn't moved).

Is it possible to be +20 feet accurate and then -20 feet accurate (for a total of 40 feet of discrepancy) without moving over a matter of 30 seconds?
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team_geomonkey
Geocacher


Joined: 07 Dec 2009

Posts: 164

PostPosted: Fri Sep 02, 2011 8:36 am    Post subject: Reply with quote

Yes - this happens to me alot. BUT what I do find out, is that the original coords that were marked are actually OK. I marked it 3-4 times and each time it was just a little off - so I walk back to the car, "find" and select the coords and then start walking and it all evens out.
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Manfromwillow
Geocacher


Joined: 04 Oct 2009

Posts: 145

PostPosted: Fri Sep 02, 2011 9:37 am    Post subject: Reply with quote

team_geomonkey wrote:
Yes - this happens to me alot. BUT what I do find out, is that the original coords that were marked are actually OK. I marked it 3-4 times and each time it was just a little off - so I walk back to the car, "find" and select the coords and then start walking and it all evens out.

I concur, I use a garmin vista hcx.
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qwerty2582
Past MnGCA Board


Joined: 03 Apr 2009

Posts: 458

PostPosted: Fri Sep 02, 2011 9:53 am    Post subject: Reply with quote

This is precisely the reason to use the waypoint averaging feature Smile
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WestSideDaddy
Past MnGCA Board


Joined: 06 Apr 2010

Posts: 559

PostPosted: Fri Sep 02, 2011 10:24 am    Post subject: Reply with quote

qwerty2582 wrote:
This is precisely the reason to use the waypoint averaging feature Smile


That's what is weird, I did use the way point average tool to create it.

Oh well. I'll try and test the coords on the way home and decide if I want to hide it there.
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tonkaMN
MnGCA Board


Joined: 10 Jun 2009

Posts: 851

PostPosted: Fri Sep 02, 2011 10:44 am    Post subject: Reply with quote

I usually use Google maps to fine tune the reading I get from my oregon. That is if there is something nearby that you can identify from a satellite image.
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bflentje
Geocacher


Joined: 29 May 2006

Posts: 4019

PostPosted: Fri Sep 02, 2011 11:44 am    Post subject: Reply with quote

I am more concerned that you're hiding a nano. Join the revolution man. Wink
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bflentje
Geocacher


Joined: 29 May 2006

Posts: 4019

PostPosted: Fri Sep 02, 2011 11:45 am    Post subject: Reply with quote

tonkaMN wrote:
I usually use Google maps to fine tune the reading I get from my oregon. That is if there is something nearby that you can identify from a satellite image.


Actually, I'd very careful using this method. Down in Goodhue County the satellite images that overlay the road maps are off by well over 60' in some places. I would, without a doubt, rely more on the GPS than the Google Maps.
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Hunter-Killer
Geocacher


Joined: 25 Apr 2009

Posts: 226

PostPosted: Fri Sep 02, 2011 4:29 pm    Post subject: Reply with quote

I do not trust the 450 period. I use it, just to justify the purchase, but always rely on Kathy with the 60csx to find ground zero. The 450 has put me in some real bizarre spots, when caching alone with it. We have updated it, but it is just not reliable. The old workhorse 60csx will get a signal in some pretty thick stuff. Way too many times have I heard Kathy say, "where the heck you going, ground zero is this way." I miss printing out cache sheets too. Shocked
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Moe the Sleaze
Geocacher


Joined: 10 Jan 2003

Posts: 1145
Location: Champlin, MN

PostPosted: Tue Sep 06, 2011 6:42 am    Post subject: Reply with quote

tonkaMN wrote:
I usually use Google maps to fine tune the reading I get from my oregon. That is if there is something nearby that you can identify from a satellite image.



Buzzzzzz. Wrong answer.
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