NavList:
A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Re: Errors in online version of HO249
From: Fred Hebard
Date: 2007 Nov 30, 09:42 -0500
From: Fred Hebard
Date: 2007 Nov 30, 09:42 -0500
Way to go Gary! On Nov 29, 2007, at 1:53 PM, glapook@pacbell.net wrote: > > Gary LaPook writes: > > I recieved the following email from the government website tha had > published H.O 249 with errors. > > "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 > > > -----Original Message----- > From: Gary J. LaPook [mailto:garylapook@pacbell.net] > Sent: Wednesday, November 28, 2007 4:26 AM > To: Webmaster_NSS > Subject: Errors found in HO 249 > > Dear Sir: > > Quite by chance I noticed an error in the on line edition of HO 249 > volume 2. I then looked for similar errors and found that there is a > systematic error in both volumes two and three. For example, on page 5 > of volume 2 covering latitude 0� in the first column covering > declination of 15� at LHA 89 the altitude given is 00-58'; for LHA 90 > the altitude is given as 00-00'; and for LHA 91 the altitude given is > 00-58' which is the same value as given for LHA 89! This is > mathematically impossible. The problem is that the altitude for LHA 91 > should be negative 00-58'. The systematic error found all across the > tables up to at least latitude 39� is that all of the last positive > altitudes tabulated should all be negative altitudes! This is also > true for the values given for contrary name declinations. For example > on page > 163 of volume 2 covering latitude 27� in the first column for 0� > declination tabulated for LHA 91 an altitude of 00-53'; for LHA 90 an > altitude of 00-00'; and again at LHA 89 an altitude of 00-53'. The > altitude for LHA 91 should be negative 00-53'. > > I compared these examples with my printed copies of these tables > printed in 1970 and these errors do not appear in the printed version > which correctly label these altitudes as negative altitudes. > > > Sincerely > > Gary LaPook > > On Nov 28, 1:33 am, glap...@pacbell.net wrote: >> I recently posted a link to the government web site where you can >> download copies of navigational publications including H.O 249. I >> quote below the email I sent to that site: >> >> "Dear Sir: >> >> "Quite by chance I noticed an error in the on line edition of HO 249 >> volume 2. I then looked for similar errors and found that there is a >> systematic error in both volumes two and three. For example, on >> page 5 >> of volume 2 covering latitude 0� in the first column covering >> declination of 15� at LHA 89 the altitude given is 00-58'; for LHA 90 >> the altitude is given as 00-00'; and for LHA 91 the altitude given is >> 00-58' which is the same value as given for LHA 89! This is >> mathematically impossible. The problem is that the altitude for >> LHA 91 >> should be negative 00-58'. The systematic error found all across the >> tables up to at least latitude 39� is that all of the last positive >> altitudes tabulated should all be negative altitudes! This is also >> true for the values given for contrary name declinations. For example >> on page 163 of volume 2 covering latitude 27� in the first column for >> 0� declination tabulated for LHA 91 an altitude of 00-53'; for LHA 90 >> an altitude of 00-00'; and again at LHA 89 an altitude of 00-53'. >> The >> altitude for LHA 91 should be negative 00-53'. >> >> "I compared these examples with my printed copies of these tables >> printed in 1970 and these errors do not appear in the printed version >> which correctly label these altitudes as negative altitudes." >> >> Sincerely >> >> Gary LaPook > > --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to NavList@fer3.com To , send email to NavList-@fer3.com -~----------~----~----~----~------~----~------~--~---