NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Another "emergency navigation" sightreductionmethod
From: Lu Abel
Date: 2015 Jul 9, 18:22 +0000
From: Lu Abel
Date: 2015 Jul 9, 18:22 +0000
Even simpler, try Stan's Celestial Tools. One of the tools allows you to enter sight data, adjustments (eg, IE, HE) into an interactive version of the USPS sight reduction form.
The only thing that prevents this from becoming a dangerous crutch is that sometimes (very rarely) the data on the body is off by 0.1' from the Nautical Almanac data (presumably due to slight differences in the way the math is done). A sight will be rejected by the sight folder grader if the body data is not exactly as given in the NA.
From: Peter Hakel <NoReply_PeterHakel@fer3.com>
To: luabel@ymail.com
Sent: Wednesday, July 8, 2015 10:06 PM
Subject: [NavList] Re: Another "emergency navigation" sightreductionmethod
Ed,
Regarding the electronic route, you can try the Excel spreadsheets available for free download from:
http://www.navigation-spreadsheets.com/
Their use eliminates much of the (sometimes frustrating) minutiae while keeping the individual steps of the sight reduction separate and visible to the student. I believe that this could make them a useful teaching tool by the divide-and-conquer approach: first, use the spreadsheets to illustrate the procedure in broad, more tractable strokes, and then, drill down on the details of achieving the same result with a calculator to satisfy the requirement.Peter Hakel
From: Ed Popko <NoReply_EdPopko@fer3.com>
To: pmh099---.com
Sent: Wednesday, July 8, 2015 8:21 PM
Subject: [NavList] Re: Another "emergency navigation" sightreductionmethod
Stan,Your comments about USPS students and signs of the time with addition and calculators find raw spots on me after teaching JN to middle-agers and retirees. Teaching Law of Cosines, a required topic, eventually gets around to dealing with calculators. Sure enough, you can bet you will loose at least one entire class to simply dealing with the mechanics of calculators. There seems to be an age gap where certain folks just can't seem to relate to calculators doing more than add, subtract, multiply and divide. Even dismissing SIN and COS etc. the concept of converting degrees and fractional minutes to decimal and vica versa, or worst yet, storing their values in registers A, B, C... for handy access are guarenteed to be killer topics.Usually, I have to write out the complete stroke sequence as many do not want to actually learn what the calculator is doing. Some get it but many do not internalize it. Not good! I do have some sympathy however. The low end scientific calculators (under $20US) are quite amazing but come with very large fold out sheets of instructions, usually in two or three languages, and printed in 6 pitch type.Sure wish I knew how to overcome this speed bump in class. I would be interested in NavList member experiences and comments.Ed
