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    Re: Homemade plotting sheets
    From: John D. Howard
    Date: 2019 Dec 19, 13:46 -0800


    I do not think her method is OK, even for practice plotting.  It is turned 90 degrees from most plotting sheets you can buy or download for free on the internet.  Look for " universial plotting sheets" -  there are many as PDF files.

    Most UPS have a fixed lattitude scale - one minute equal one mile of lattitude.  Works from zero latitude up to 90.  It is the longitude lines that get closer as you go north ( or south ).  With the normal UPS you can use the same sheets for the whole voyage.  The latitude scale stays the same and is used to mark off your intersepts.  With one vertical line labed as your middle longtitude ( or AP longitude ) you do not usually need more lines.  Rember, even with only one longitude line the sheet will plot plus or minus 60 miles.

    To measure longitude just draw a diagonal line at the same angle as your middle latitude.  If you need to draw another longitude line just go out on the diagonal line 60 minutes of latitude distance then drop down a vertical line.  If you need the longitude of a fix then just go up or down vertical to the diagonal line and measure where the vertical line cuts the diagonal.  The length of the line - measured using the latitude scale is your longitude from the center vertical line.

    Best thing is to download a free UPS off the net and print as needed.

    The other   John Howard    41N  100W

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