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» Online Classroom   »   » Public Discussion of Cel Nav   » 5.7 exercise#1

Author Topic: 5.7 exercise#1

 - posted September 20, 2017 05:45 PM      Profile for Mark           Edit/Delete Post 
I don't see how to get a HC of 53 34.4'? I've. Been through this
Several times and get a HC of 53 34'. Where does the .4' come from?

From: Montreal
Capt Steve Miller

 - posted September 20, 2017 07:49 PM      Profile for Capt Steve Miller           Edit/Delete Post 
You should have the Declination as N19* 34.4'.
Then in Box 5 in the Dec min. Box you should enter that 34.4'.
Since this is a LAN sight and your Box 5 d is 60 the d corr would be 34.4 and that added to the Tab Hc gives a result of 53* 34.4'.

From: Starpath
Capt Steve Miller

 - posted September 20, 2017 07:56 PM      Profile for Capt Steve Miller           Edit/Delete Post 
BTW - I should have added that there is no question 5.7 #1 it is 5.8 #1.
From: Starpath
David Burch

 - posted September 20, 2017 09:22 PM      Profile for David Burch           Edit/Delete Post 
Note that these exercises are essentially redoing the ones of 3.4 and we use data from that one to do this one. Before we just did a noon sight, now we are treating the sextant sights as if they were just regular sunlines.

... by the way, i think that exercise was 5.7 in an older edition of our book. If you have a course s/n or an ebook s/n you can download the latest edition at no charge.

There is a big upgrade in the text of the latest edition, called on the cover second edition.

If you do not have a serial number, but own the first edition, you can buy the new one at 50% off at this link http://www.starpath.com/celnavbook/

From: Starpath, Seattle, WA

 - posted September 21, 2017 03:24 PM      Profile for Mark           Edit/Delete Post 
Thanks for the reply. I guess I have an older copy. The corrections are in whole numbers, as the d60 correction at 34.4' would be 34 ? Is the .4 an interpolation between the 34' and 35' ?
From: Montreal
David Burch

 - posted September 21, 2017 04:28 PM      Profile for David Burch           Edit/Delete Post 
Yes, if using Pub 249 it is. we explain that in the old book only briefly in the answers section, but there is a clearer presentation in the new book.

I recommend the new edition as it has expanded coverage of several points and new content, as well as an improved structure of exercises.

From: Starpath, Seattle, WA

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