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Archiver > DEED-MAPPER-USERS > 2009-12 > 1260202107


From: "Steve Broyles" <>
Subject: Re: [DMU] magnetic vs true north
Date: Mon, 7 Dec 2009 11:08:27 -0500
References: <OHEFLOBFIDIJKKGMLGOICEDJCEAA.jimvgill@windstream.net>


Yes, the maps are oriented to true north and the surveyors used magnetic compasses
that had some amount of error. In some places and times their surveys were compensated
to remove the error, but in my experience they were seldom corrected. The error is
called "declination".

You can rotate a parcel by including a "Decl" line at any point prior to the first Pt, e.g.

Decl 3

This will rotate the parcel 3 degrees clockwise. Decl -2.5 will rotate 2.5 degrees counterclockwise.

Steve Broyles

----- Original Message -----
From: "James Gill" <>
To: "Deed Mapper" <>
Sent: Monday, December 07, 2009 9:22 AM
Subject: [DMU] magnetic vs true north


> I've noticed that many of my plots along waterways do not line up.
> Obviously, they won't perfectly, but, it would seem if they were rotated
> just slightly they would line up better. Is this a function of the variance.
> Most of my surveys mention about 3 degrees sometimes as high as 3 degrees 50
> minutes. Are the maps set to true north and the surveys magnetic north? Is
> there a way to rotate a plot the amount of the variance specified?
>
> ----- ----- ----- -----
> Jim Gill
> e-mail:
> website: www.jimgill.net
>
>
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