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Its good to know  that you can get Bowditch online at no cost since a new
copy of the Pub, which may be available only in softcover costs a bundle.
Not a very shippy binding.

If you can get a copy of the "Best of Sail Cruising", first edition, not the
later two, you will find an article that explains how to create a small area
plotting sheet using the ruled lines in your logbook. I think it was
published around 1976.

It is really quite simple. The easiest way is to designate the horizontal
lines as lat. Then draw from the apex of the lower left corner a line whose
angle equals the degrees of Mid-lat. That becomes you measure of Dlat or NM.
(nautical miles). You can define the Dlong in any increments you want such
as the space between the line being 1, 2, 5, 10 NM. Then strike you vertical
lines to equal long. That's all there is to it. Plot as you normally would.

If you want, you can set the ruled lines as long, and do basically the same
thing, but the difference between them will be departure.

That's the way I plotted all my sights once I was at it for a while. It cuts
down the tedium of starting with a blank piece of paper.

My copy of the book is in storage as our most of our things so I wrote this
from an admittedly shaky memory. If I left something out, excuse it.

Joel Jacobs


----- Original Message -----
From: "Tony Cappiello" 
To: 
Sent: Tuesday, January 27, 2004 11:07 PM
Subject: DIY plotting charts


> Murry
>
> Bowditch's "The American Practical Navigator" is available online at the
following website . You can download the entire document at once or a
chapter at a time. This should get you started without spending any $. This
is the reference or at least one of the references you should have. It
contains a wealth of information. There are several other documents at this
site which may be of interest to you as well.
>
> Enjoy!
>
> http://pollux.nss.nima.mil/pubs/
>
>
> Tony Cappiello
> -----Original Message-----
> From: Navigation Mailing List
> [mailto:NAVIGATION-L@LISTSERV.WEBKAHUNA.COM]On Behalf Of Murray Campbell
> Sent: Tuesday, January 27, 2004 17:30
> To: NAVIGATION-L@LISTSERV.WEBKAHUNA.COM
> Subject: DIY plotting charts
>
>
>  the books i'm trying to learn from mention that it is
> possible to make your own plotting charts on graph or
> blank paper, but they don't give any more info...
>
>  it seems like i will need to create a map projection
> for the needed lattitude...i'm not sure how i go about
> scaling lattitude to longitude at different
> lattitudes...is there a formula that does this??
>
>  (i would rather not be dependent on buying and
> stowing a bunch of plotting charts)
>
>  thanks, m

   

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