
NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Need help to track down errors
From: Gary LaPook
Date: 2008 Nov 13, 05:12 -0800
From: Gary LaPook
Date: 2008 Nov 13, 05:12 -0800
According to the email I got from the government office, the errors started in 1999, see attached: Mr. LaPook Thank you for bringing this error to our attention. It seems that the Sight Reduction Table generation code improperly formatted entries beginning with -0, inserting 00 instead. I am in the process of manually updating the electronic publications, which will be posted to our Web site in the very near future. The errant publications were originally produced and posted to our Web site in 1999. Which mean that, in their 8+ years of service, you are the first and only user to notice the error! Regards, Tim Doherty Office of Global Navigation/Technology National Geospatial-Intelligence Agency (301)227-1075 On Nov 12, 4:08 pm, Ken Gebhartwrote: > To all List Members, > > Need help to track down errors! > > I have been made aware of many errors on page 158 of Pub 249 Vol 2 > Apparently all of the Hc values on the page are wrong! For example, > for dec 0, LHA 0, Lat 26 (page 158), Hc is shown as 65 deg. When it > should be 64 deg by simple inspection. All the other numbers are > also off by varying amounts as can be found by computation. There > are some other errors too, of a different kind on other pages. For > example, page 160. Look at the column for dec 15 deg, and go down to > LHA 98. By simple inspection you can see that there should be a > minus sign before Hc 00-25, but it is not there. I believe this is > typical of many Hcs near zero. > > These errors are present in the US Government Edition, privately > published editions, and the PDF on the NGA website. I have spoken to > the UK Almanac Office, and they report that the errors do not exist > in their equivalent to 249 V2, or their Rapid Sight Reduction Tables, > and can find no trace or knowledge of them. > > I am asking anyone who has an older copy of this volume, to check it > for these errors and report the publication date. Maybe we can track > down when they first appeared. By the way, a friend did phone the > NGA to report this, and was told that �they would look into it�. > > Thanks, Ken Gebhart --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To unsubscribe, email NavList-unsubscribe@fer3.com -~----------~----~----~----~------~----~------~--~---