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Re: DIY plotting charts
From: Courtney Thomas
Date: 2004 Jan 28, 08:30 -0500
From: Courtney Thomas
Date: 2004 Jan 28, 08:30 -0500
Older copies [and newer] of Bowditch can be had very cheaply at www.abebooks.com. HTH Joel Jacobs wrote: > 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 >> > -- Courtney Thomas s/v Mutiny lying Oriental, NC WDB5619