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Forums —» General Caching —» How To? —» True North
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True North
Have question about how to use your GPS, hide a cache or solve a problem, let the local experts try to help.
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Wolf



Joined: Apr 18, 2005
Posts: 2
Location: Hmmmm, I'll check my GPS

PostPosted: Sun Aug 24, 2008 9:25 am    Post subject: True North Reply with quote

Hi,
When setting up your GPS what do you use for your "North Reference" Magnetic or True??. I'm confused on this issue!

Your help is much appreciated!
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QuigleyJones



Joined: Mar 09, 2005
Posts: 135
Location: Raincouver

PostPosted: Sun Aug 24, 2008 10:37 am    Post subject: Re: True North Reply with quote

I prefer Grid North Very Happy



It doesn't really matter, unless your using a map or doing a puzzle.

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tjguy98



Joined: Aug 06, 2005
Posts: 206
Location: Maple Ridge

PostPosted: Sun Aug 24, 2008 9:26 pm    Post subject: Re: True North Reply with quote

Most cachers around Vancouver seem to reference TRUE north in their instructions if they want you to go X number of degrees north.

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Read about my geocaching adventures on my website at:
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Crowfoote



Joined: Dec 26, 2006
Posts: 2
Location: coquitlam

PostPosted: Sat Feb 21, 2009 12:41 pm    Post subject: Re: True North Reply with quote

would that not cause some errors in locating as a compass points to Mag N so you would need to fator in compass deviation from your location
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geodug



Joined: Apr 13, 2004
Posts: 161

PostPosted: Sat Feb 21, 2009 12:54 pm    Post subject: Re: True North Reply with quote

Crowfoote wrote:
would that not cause some errors in locating as a compass points to Mag N so you would need to fator in compass deviation from your location

Back in the old days (pre GPS), people used compasses and adjusted the magnetic declination on them so that the compasses would point to true north.

I set my GPS to true north and carry a cheap compass without the adjustment to point to magnetic north in case a hider uses magnetic north for a multi-cache or whatever.
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Technic



Joined: Feb 29, 2008
Posts: 73
Location: Kamloops

PostPosted: Sun Feb 22, 2009 9:19 pm    Post subject: Re: True North Reply with quote

It may not matter much, unless the cache refers to a map and clues indicted on the map. Then set your GPS to the references on the map.
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couloir



Joined: Jan 19, 2008
Posts: 152
Location: Kamloops

PostPosted: Wed Feb 25, 2009 2:22 pm    Post subject: Re: True North Reply with quote

As a long time orienteerer, we made our maps with magnetic north, using the declination for the particular area. In other words, the grid lines were drawn to the magnetic bearing but represented as the top of the page and the whole map would have been rotated accordingly. This is what the word orienteering means, that is rotating your map to show the N bearing pointint to magnetic north. In that way, the compass gave us accurate bearings. An error of 5 degrees over half a kilometre will take you a long way from your target. When we used commercial topo maps, we had a declination adjustment (a small screw) on the side of various Polaris, Suunto, and other brands that we could adjust the declination on the compass instead of trying to draw new lines on our map. If the distance is short enough and you have a steady hand (hold your compass flat in front of your chest), you could dial the bearing subtracting or adding the declination first. When I use my GPSr, I never really know if the cache hider has used magnetic or true north, or has even been accurate so what I do is follow an averaged bearing for the distance, then do a perimeter circle left and right keeping the distance constant. This is a specific navigating technique that many orienteers use, particularly those who do long distance routes.
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