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Compass Rose for map reproductions
By:Shawn Baker
Date: 8/12/1999, 11:07 am

Howdy All, After learning to navigate using the true north/magnetic north compass rose on an NOAA chart, I wanted to be able to use a rose on non-NOAA and inland charts (which NOAA doesn't make). I know West Marine has stick-on compass roses, but they only have a single rose for either true north or magnetic north, but not both.

I drew a compass rose on CAD last weekend so that I could photocopy it onto non-NOAA charts. All you have to do is download the rose (in a .dxf format, import it into your CAD platform, look up the declination, and rotate the inner ring to that declination amount and print it out.

The NOAA page for calculating declination: http://www.ngdc.noaa.gov/cgi-bin/seg/gmag/fldsnth1.pl

You'll need to either photocopy your map or use a map/chart that can be manually-fed into the copier--place the rose on the glass in roughly the spot you want it to show up on on the map, feed the paper, and voila! a compass rose on your chart.

Shawn

Messages In This Thread

Compass Rose for map reproductions
Shawn Baker -- 8/12/1999, 11:07 am
Re: Compass Rose for map reproductions
Dave Houser -- 8/12/1999, 2:56 pm
Re: Compass Rose for map reproductions
Shawn Baker -- 8/12/1999, 5:47 pm