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Greg,

I humbly admit I made a mistake in the remarks on the left lower corner of the worksheet, and I would suggest either to ignore it or wait until I have posted the

corrected one. This will happen asap.

I could have changed the remarks but the changed wording would lead to an odd "explanation" that wouldn't have been useful any more.

Also, as an aside: I have by now re-traced quite a number of published sight reductions. There is an astonishing number that are off by as much as 1 degree! Re-doing those - and doing them correctly - was quick and easy with our method.

H

On Sun, Jan 18, 2015 at 6:56 AM, Greg Rudzinski <NoReply_Rudzinski@fer3.com> wrote:

Good work Hanno ! Add to this a laminated 1 page long term almanac and the compact all weather non-electronic no compromise CN sight reduction kit is born.

 

Greg Rudzinski

 

From: Hanno Ix
Date: 2015 Jan 17, 16:31 -0800

Attached are pictures of a 4-page brochure where I put  into one package all the components you need to do sight reduction by hand. It contains a worksheet, the hav-table for the hav-DONIOL method and the azimuth diagram. The pages are laminated and bound so they will withstand some rough work on the water. You can treat the lamination such that it accepts repeated writing with pencil and erasing. More on that later.

There will be always navigators who prefer their computers, calculators, tables or slide rules of the straight, circular or tubular kind. Nothing wrong with that. This brochure is meant for those who want, or need, to use the barest possible means without sacrificing accuracy. It is also is the cheapest tool for the purpose I can think of. And its mechanics will never break since there aren't any.

The process on the worksheet is easy to follow. It contains a simple scheme for the one multiplication that occurs in the hav-DONIOL formula delivering directly - and only - the needed four leading digits of the result in short order. Virtually all the tools I mentioned above were invented to do sight reduction without having to execute the dreaded and error-pronelonghand multiplications. This scheme here will, I think, keep the pain at a very acceptable level and it is easy to check. You still can use your calculator if you prefer. It takes about 7 minutes to complete the calculations.

As to the lamination: standard lamination does not accept pencil marks but will after you roughened it up slightly with a very fine sandpaper. But neither the eraser at the end of a standard pencil nor water will erase properly, however the white "Steadtler" type will  do very well. I hear a product of www.oregonlam.com will accept pencil marks that are easly erasable, too. I haven't tried it yet.

I gave the brochure the name MHR-2015 since it is a modern-day self contained tool for sight reduction just as the MHR's were. It performs as well, takes less space and it is much, much simpler to build. Try it !

 

H