# How do I find a true east, west , north, or south line? How do I tell how far off that line I am?

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• canklam2377 Sep 19, 2010

THAT DOESN'T TELL ME HOW TO SET MY GPS. i WANT TO KNOW WHAT I SET MY GPS ON TO FIND AN EXACT EAST/WEST LINE, LIKE IN FINDING A CORNER POST!

• canklam2377 Sep 20, 2010

I am trying to walk a straight east/west line with my GPS to try and figure a line for dividing my property before contacting a surveyor. I need to know what I set my GPS to(map, navigation, whatever) to tell me how many feet off the straight line I am.

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You can get geological maps with lattitudes and longitudes, and find a location that meets a crossing criteria, and I think there are provisions in Google Earth that can supply that information. When you can identify a point of intersection, then a longitudinal or lattitudinal line, go there and see what the gps says, and you will have your margin of error. Typically, they're good to within 20 or 30 feet, I've heard.

Posted on Sep 21, 2010

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That thing is accurate to within something like 3-5 meters? And speed accuracy to within 15 fps. I don't think you can go wrong with one, it is going true. I have an old handheld and it is so exact, it is frightening. They know where they are. As far as magnetic north goes, if you are heading to the north pole, it might be off a hair, but for down here, it is exact. Most roads are set up north, south east, etc, If you follow a road in a straight line, it should read the same degrees all the way. The GPS is more accurate than the survey that built the road. Hope this helps.

Posted on Sep 19, 2010

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All readings are taken the grenwich meridan which is the same as the time zones ,for east and west and the equater for the north and south reading ,as far as i know ,so where ever you are you are at a reading from them settings .

Posted on Sep 19, 2010

Hi,
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Posted on Jan 02, 2017

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v\:* {behavior:url(#default#VML);} o\:* {behavior:url(#default#VML);} w\:* {behavior:url(#default#VML);} .shape {behavior:url(#default#VML);} Normal 0 false false false MicrosoftInternetExplorer4 st1\:*{behavior:url(#ieooui) } /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} It’s hard to cover all the details in a forum like this but I’ll give you a quick primer. I can send you a powerpoint presentation that explains it in a little more detail. To really learn how to read latitude and longitude you should pick up a copy of “Chapman’s Piloting and Seamanship.”

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