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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
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