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Puzzle accuracy


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#1 Team_J

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Posted 05 June 2013 - 08:39 AM

I have a puzzle cache that needs a slight tweaking, as one of the permanent clues was changed in the name of progress.  The problem is that I will need a new clue that is three digits long for the decimal portion of the north coordinate.

 

Do any of you puzzle fans know how far each thousandth moves a cache to the north or south?

 

How far is 42 59.857, -77 12.345 from 42 59.856, -77 12.345?

 

dadJ of Team_J

 

(Edit: added bogus west coordinates)



#2 Thot

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Posted 05 June 2013 - 08:58 AM

6.1 feet 

 

I didn't know what the -77 was


Edited by Thot, 05 June 2013 - 09:05 AM.


#3 Team_J

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Posted 05 June 2013 - 09:04 AM

Thank Thot.  You might remember when someone relocated my multi-ton virtual cache.  Now a state highway department has gone and explosively demolished one of my clues.



#4 SockPuppet

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Posted 05 June 2013 - 08:58 PM

I use the rule of 5 feet for each 0.001. Close enough for government work.


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#5 heftydude

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Posted 05 June 2013 - 09:17 PM

Per this log entry:  http://www.geocachin...47-82c3ad306ec2

 

It is 6.2'

 

So, when is GC going to go to thousandths on their coordinate system?  I would love for the aforementioned cache to have a .62' level of accuracy. :tickedoff:


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#6 Thot

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Posted 06 June 2013 - 08:14 AM

Per this log entry:  http://www.geocachin...47-82c3ad306ec2

 

It is 6.2'

 

I think GC is wrong.



#7 TravelingGeek

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Posted 06 June 2013 - 08:29 AM

 

I think GC is wrong.

 

 

 

Impossible!


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#8 Thot

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Posted 06 June 2013 - 08:37 AM

 

 

I think GC is wrong.

 

 

Impossible!

 

In their eyes, I know.



#9 HoustonControl

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Posted 06 June 2013 - 09:40 AM

If you do the math, it works out to 6.0700 ft per thousandth minute of latitude -- so, yeah, I'd go with 6.1.  Of course that doesn't work with longitude.


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#10 Great Birds

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Posted 06 June 2013 - 10:18 AM

For longitude, use 6.1'  times the cos() of the latitude.  For Houston, figuring 29.75 degrees north, the cos() is about 0.868. The distance is 6.1' * 0.868 or 5.3'


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#11 Great Birds

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Posted 06 June 2013 - 10:36 AM

It also turns out that an arc minute (one nautical mile at the equator) is almost one statue mile (going east/west) in Houston,  Making a thousandth of a minute in Houston ~ 5.3 feet.


Edited by Great Birds, 06 June 2013 - 10:37 AM.


#12 Baytown Bert

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Posted 06 June 2013 - 10:50 AM

WAIT! No one said there was going to be math!!!

TXGA SETX Representative


#13 Team_J

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Posted 06 June 2013 - 12:09 PM

Thanks for the help.  And the math.  I will use six feet when I seek a new clue for the cache.

 

Here is a link to the old clue going buh-bye:

 

http://www.youtube.c...PCddveo#t=1m40s

 

Here is the cache in question:

 

http://www.geocachin...aspx?wp=gc1c0hm

 

You know the drill - feel free to visit the cache page, but please don't post solutions.

 

dadJ of Team_J






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