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Trekkin and Birdin
WGA Member



Joined: 2007-02-08
Posts: 5983
Location: West Salem WI

PostPosted: Sat Jun 13, 2009 8:24 am Reply with quote Back to top

I've found a couple puzzle listings that require the solver to do triangulations or confluences based on other cache listings. I understand the basic concept in theory, but am struggling to figure out how to determine coordinates this way.

Sure, I could take the old compass and a paper map, but that's still pretty hit or miss. I know there must be some trick. Enlighten me, please!

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Trekkin' and Birdin'
Let's just go out and find caches and be done with it! 
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marc_54140
WGA Member



Joined: 2004-01-28
Posts: 2631
Location: Little Chute

PostPosted: Sat Jun 13, 2009 9:30 am Reply with quote Back to top

If it's S|S's, it does not work .....
 
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Trekkin and Birdin
WGA Member



Joined: 2007-02-08
Posts: 5983
Location: West Salem WI

PostPosted: Sat Jun 13, 2009 10:18 am Reply with quote Back to top

Nope, these are in Rochester MN.

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Trekkin' and Birdin'
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gotta run
WGA Member



Joined: 2007-11-26
Posts: 3306

PostPosted: Sat Jun 13, 2009 11:34 am Reply with quote Back to top

I use ExpertGPS for this. If you have ExpertGPS but don't know how to do it, let me know. If you don't have it, I'm not sure how I would get it done.
 
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Trekkin and Birdin
WGA Member



Joined: 2007-02-08
Posts: 5983
Location: West Salem WI

PostPosted: Sat Jun 13, 2009 4:50 pm Reply with quote Back to top

Hmmm, I just looked at that program and am asking myself...how much more money do I really want to throw at this hobby?

I guess there's always the option of just skipping those caches. They appealed the the structural engineer's grand-daughter, but I don't think I got enough of those brain cells myself!

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Trekkin' and Birdin'
Let's just go out and find caches and be done with it! 
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gotta run
WGA Member



Joined: 2007-11-26
Posts: 3306

PostPosted: Sat Jun 13, 2009 6:35 pm Reply with quote Back to top

Trekkin' and Birdin' wrote:
Hmmm, I just looked at that program and am asking myself...how much more money do I really want to throw at this hobby?

I guess there's always the option of just skipping those caches. They appealed the the structural engineer's grand-daughter, but I don't think I got enough of those brain cells myself!


It's paid for itself! Well, not really but it sure comes in handy. I've used it to solve triangulation puzzles in the field just having the laptop along. It makes quick work of it, either by projection based on bearing and distance or by projecting proximity circles to see where multipe circles intersect.

It also comes in handy for things like checking on proximity to existing waypoints, not that I can think of a reason why you might need to do that. Twisted Evil

The biggest drawbacks are cost and the fact that the sat maps seem to be getting old. But we use it at least weekly.
 
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marc_54140
WGA Member



Joined: 2004-01-28
Posts: 2631
Location: Little Chute

PostPosted: Sat Jun 13, 2009 8:32 pm Reply with quote Back to top

What's FizzyCalc?
 
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Trekkin and Birdin
WGA Member



Joined: 2007-02-08
Posts: 5983
Location: West Salem WI

PostPosted: Sat Jun 13, 2009 8:38 pm Reply with quote Back to top

I looked at it and I guess it figures some stuff out, but I couldn't figure out how it would work to get me coordinates based on the listed caches.

Ignore, ignore, ignore. I can do this!

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Trekkin' and Birdin'
Let's just go out and find caches and be done with it! 
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marc_54140
WGA Member



Joined: 2004-01-28
Posts: 2631
Location: Little Chute

PostPosted: Sat Jun 13, 2009 8:49 pm Reply with quote Back to top

I've plotted lines on a map before. But not 7000 miles! Still, probably would get you a very good area to hunt in.

Which caches are you looking at?
 
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gotta run
WGA Member



Joined: 2007-11-26
Posts: 3306

PostPosted: Sun Jun 14, 2009 6:12 am Reply with quote Back to top

Trekkin' and Birdin' wrote:
Nope, these are in Rochester MN.


If this is the one I'm thinking of, I solved it in less than 5 minutes using ExpertGPS while humming "I walk the line."

Actually, you only need to "biangulate" because of the GC proximity-to-dummy-coordinate rule, but triangulation makes you extra sure.

We have a puzzle cache like this, that can be solved exactly the same way. Right Marc? Here's how:

Image

Zoom way in on the intersection area and drop a waypoint. The accuracy will be within a reasonably small search distance.
 
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marc_54140
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Joined: 2004-01-28
Posts: 2631
Location: Little Chute

PostPosted: Sun Jun 14, 2009 5:51 pm Reply with quote Back to top

Yup! I'm looking at it out my window.........
 
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-cheeto-
WGA Member



Joined: 2007-06-12
Posts: 4538
Location: Appleton, WI

PostPosted: Sun Jun 14, 2009 10:33 pm Reply with quote Back to top

every time i read the subject of this thread it comes out strangulation...
 
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seldom|seen
WGA Member



Joined: 2006-12-31
Posts: 733
Location: Appleton, WI

PostPosted: Tue Jun 16, 2009 6:35 am Reply with quote Back to top

It's also quite simple to do mathematically. Let's say you have the location of 3 caches and need to use them to triangulate the location of a fourth.

Covert your cords to decimal minutes and then apply the following:

Cache A [N˚W˚/3] + Cache B [N˚W˚/3] + Cache C [N˚W˚/3] = Cache D N˚W˚

It's that easy, really!
 
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Trekkin and Birdin
WGA Member



Joined: 2007-02-08
Posts: 5983
Location: West Salem WI

PostPosted: Tue Jun 16, 2009 7:21 am Reply with quote Back to top

Alex, thanks, that I can probably do!

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Trekkin' and Birdin'
Let's just go out and find caches and be done with it! 
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seldom|seen
WGA Member



Joined: 2006-12-31
Posts: 733
Location: Appleton, WI

PostPosted: Wed Jun 17, 2009 5:37 pm Reply with quote Back to top

Trekkin' and Birdin' wrote:
Alex, thanks, that I can probably do!


Just remember that the final location of the one of which I speak has moved...
 
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