Question about Garmin eTrex Legend GPS Receiver

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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.
Hope I've answered your question.

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

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What is the zip code of london?


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London postal district | London East Central
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WC1 Head District | WC2 Strand

London postal district | London North
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NW7 Mill Hill | NW8 St John's Wood | NW9 The Hyde | NW10 Willesden | NW11 Golders Green

London postal district | London East

E1 Head District | E2 Bethnal Green | E3 Bow | E4 Chingford | E5 Clapton | E6 East Ham | E7 Forest Gate | E8 Hackney | E9 Homerton | E10 Leyton | E11 Leytonstone | E12 Manor Park | E13 Plaistow | E14 Poplar | E15 Stratford | E16 Victoria Dock | E17 Walthamstow | E18 Woodford
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W1 Head District | W2 Paddington | W3 Acton | W4 Chiswick | W5 Ealing

W6 Hammersmith | W7 Hanwell | W8 Kensington | W9 Maida Vale | W10 North Kensington

W11 Notting Hill | W12 Shepherds Bush | W13 West Ealing | W14 West Kensington

London postal district | London South East
SE1 Head District | SE2 Abbey Wood | SE3 Blackheath | SE4 Brockley | SE5 Camberwell | SE6 Catford | SE7 Charlton

SE8 Deptford | SE9 Eltham | SE10 Greenwich | SE11 Kennington | SE12 Lee | SE13 Lewisham | SE14 New Cross

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SE27 West Norwood | SE28 Thamesmead

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Follow these directions from the starting position to the far south.
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  • North
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Garmin Hand held GPS Operation


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.”

The earth is divided into parallels of latitude and meridians of longitude, also known as lines of position.

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Latitude is measured north and south of the equator, with the equator represented as 0 degrees, and the poles being represented as 90 degrees North or South. Latitude lines are paralel to the equator. For example, if I was at the equator I would be at 0 degrees. If I traveled exactly 60 nautical miles to the north, I would be at 1 degree North, and if I traveled another 60 miles I would be at 2 degrees north. Your GPS display will preface the Latitude measurement with an “N” for positions North of the equator and an “S” for positions south of the equator.

Longitude measures your position east or west from the Prime Meridian, which is a line represented as 0 degrees that bisects the earth from north to south and passes through Greenwich England. Halfway around the earth at the International Dateline Longitude is 180 degrees. Measuring Longitude is a little more complicated because the lines are not parallel and requires an accurate clock (your GPS) to compare time at your location relative to the time in Greenwich England. Your GPS display will preface the Longitude measurement with a “W” for positions west of Greenwich and an “E” for positions east of Greenwich.

To make more accurate measurements each degree is divided into 60 minutes. Because the lines are parallel, 1 minute of latitude is equal to 1 nautical mile. Each minute can be further divided into 60 seconds. Each second is roughly equivalent to a distance of 100’ Instead of seconds, the default setting on your Garmin breaks the minute down into tenths, hundredths, and thousandths for meven more precise measurements. Because they are not parallel, lines of Longitude are measured the same way, but the distances vary depending on how far north or south of the equator.

To find out where you are with a GPS, you need a map that shows lines of latitude and longitude on it. The lines will be labeled on the map or along the borders of the map. Most nautical charts show the latitude measurements along the right the left border of the map. Longitude measuremnts will be shown along the top and bottom edges.

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