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Inspection tables such as H.O. 214 and H.O. 249 can be more usefull
for some things than the trig based tables, H.O. 211, H.O. 208,
A.A.A., Weems Line of Postion Book, etc. and calculators.  Sometimes
it is quite helpfull to be able to just run your finger down the
column of precomputed altitudes and azimuths to find the answer to
your question. (I don't extend this comment to H.O. 229 due to the
different arranagement of the tables.) H.O. 214 is especially usefull
in this regard since it tabulates the difference between adjacent
values due to change of declination (delta d)  and also the difference
between adjacent values due to the change in LHA (delta t.)

Regarding H.O. 214, I have seen it mentioned that a number of errors
had been found in these tables, is there a source for errata sheets?


gl


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